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SERVICE MANUAL

1. I L111 Are connector CN10A on the indoor electronic control P C Connect the connector or repair discon CHAT board or lead wires discon Yes nection nected Replace the indoor electronic control P C board Indoor electronic control P C board CN10A GND JPG OBH589D Re D How to check miswiring and serial signal error MUZ EF Type Turn the main power supply OFF J Is there rated voltage in the power supply y Yes Check for incorrect indoor outdoor connecting wiring Y Was the indoor unit ever connected to the Multi MXZ series and operated J o No Check the power supply Yes turned on The connection information to the Multi series is stored in the indoor unit Refer to Deleting the memorized abnormal condition described in 11 2 1 to clear the error history When the error history is being cleared the con nection information also will be initialized The indoor unit will be compatible with low standby power model after initialization A Y B the main power supply ON Check for miswiring broken wires and loose Y No wire connection between the main power Is there rated voltage between outdoor terminal block S1 and S2 supply and outdoor terminal block S1 and yres between the main power supply and outdoor terminal block S2
2. 1 Receiver board cpm T o J 12VDC 54 5 1 2 pr cet 14 0 alo 5VDC m e UN 2 1 1 S 9 2 INL ot IN Vane motor 151 ERE D 0 sa 0 1020 30 40 50 60 Display board b zs Temperature gel o ap De Fm o arar 4 z NP Hi v Ce EL ue I gt o o or 39 5 8TeTeToToTo o o z OO cH Je E el es T 91 ceres PRES 0001090 Room temperature ther SEO z GRDShort eae mistor CN111 GND Indoor coil ther mistor RT12 RT13 CN112 Timer short mode To disable Auto restart function point JPG JPS Refer cut the Jumper wire to JR77 to 8 1 Refer to 8 4 Switch board Emergency operation switch E O SW SW1 37 11 DISASSEMBLY INSTRUCTIONS lt Terminal with locking mechanism Detaching points gt The terminal which has the locking mechanism can be detached as shown below There are two types Refer to 1 and 2 of the terminal with locking mechanism The terminal without locking mechanism can be detached by pulling it out Check the sh
3. Fixing the indoor coil thermistor There are 2 forms of parts for fixing the indoor coil thermistor When fixing the indoor coil thermistor i to the clip shape holder shape part the Clip shape Holder shape lead wire should point down About the same length Position and procedure for mounting the clip shape part 1 Set the indoor coil 2 Check the marked 3 Mount the thermistor in the center mounting position clip shape part of the clip shape part NOTE m Take care to avoid loss and accidental falling of the clip shape part inside the unit m Mount the clip shape part on the marked position m Do not pull the lead wire when removing the indoor coil thermistor MITSUBISHI ELECTRIC CORPORATION HEAD OFFICE TOKYO BLDG 2 7 3 MARUNOUCHI CHIYODA KU TOKYO 100 8310 JAPAN Copyright 2010 MITSUBISHI ELECTRIC CORPORATION Distributed in Mar 2014 No OBH589 REVISED EDITION D Distributed in Jan 2014 No OBH589 REVISED EDITION C Distributed in Nov 2012 No OBH589 REVISED EDITION B Distributed in Mar 2011 No OBH589 REVISED EDITION A Distributed in Nov 2010 No OBH589 New publication effective Mar 2014 Made in Japan Specifications are subject to change without notice 42
4. 8 3 HOW TO SET REMOTE CONTROLLER EXCLUSIVELY FOR A PARTICULAR INDOOR UNIT MSZ EF VE2W B S A maximum of 4 indoor units with wireless remote controllers can be used in a room To operate the indoor units individually with each remote controller assign a number to each remote controller according to the number of the indoor unit This setting can be set only when all the following conditions are met The remote controller is powered OFF Weekly timer is not set Weekly timer is not being edited 1 Hold down button on the remote controller for 2 seconds to enter the pairing mode 2 Press button again and assign a number to each remote controller Each press of button advances the number in the following order 1 2 gt 3 4 3 Press button to complete the pairing setting After you turn the breaker ON the remote controller that first sends a signal to an indoor unit will be regarded as the remote controller for the indoor unit Once they are set the indoor unit will only receive the signal from the assigned remote controller afterwards 8 4 AUTO RESTART FUNCTION When the indoor unit is controlled with the remote controller the operation mode the set temperature and the fan speed are memorized by the indoor electronic control P C board AUTO RESTART FUNCTION automatically starts operation in the same mode just before the shutoff of the main power Operation CD If the main pow
5. a 2 PART NAMES AND FUNCTIONS MSZ EF18VEW MSZ EF22VEW MSZ EF25VEW MSZ EF35VEW MSZ EF42VEW MSZ EF50VEW MSZ EF18VEB MSZ EF22VEB MSZ EF25VEB MSZ EF35VEB MSZ EF42VEB MSZ EF50VEB MSZ EF18VES MSZ EF22VES MSZ EF25VES MSZ EF35VES MSZ EF42VES MSZ EF50VES Front panel Air filter Nano platinum filter Air cleaning filter Electrostatic anti allergy ESSSSSS A A enzyme filter option TOSS Heat exchanger Remote control Operation receiving section indicator lamp Remote controller ACCESSORIES MSZ EF22VEW MSZ EF25VEW MSZ EF35VEW MSZ EF22VEB MSZ EF25VEB MSZ EF35VEB MSZ EF22VES MSZ EF25VES MSZ EF35VES MSZ EF18VEW MSZ EF18VEB MSZ EF18VES MSZ EF42VEW MSZ EF42VEB MSZ EF42VES MSZ EF50VEW MSZ EF50VEB MSZ EF50VES Installation plate Installation plate fixing screw 4 x 25 mm Remote controller holder Fixing screw for 3 5 x 16 mm Black Battery AAA for remote controller Wireless remote controller Felt tape For left or left rear piping Soft dry cloth VEB type only OBH589D MSZ EF18VE2W MSZ EF22VE2W MSZ EF25VE2W MSZ EF35VE2W MSZ EF42VE2W MSZ EF50VE2W MSZ EF18VE2B MSZ EF22VE2B MSZ EF
6. LL rl lr rn 1 94 2 110 Air out Drain hose H F H 46 5 193 2 Lh Insulation 937 O D line 26 35 0 5 m Flared connection 06 35 99 52 0 43 m Flared connection 29 52 18 22 25 35 42 212 7 50 Drain hose Insulation 228 O D Connected part 216 O D Gas line OBH589D E 6 WIRING DIAGRAM MSZ EF18VEW MSZ EF22VEW MSZ EF25VEW MSZ EF35VEW MSZ EF42VEW MSZ EF50VEW MSZ EF18VEB MSZ EF22VEB MSZ EF25VEB MSZ EF35VEB MSZ EF42VEB MSZ EF50VEB MSZ EF18VES MSZ EF22VES MSZ EF25VES MSZ EF35VES MSZ EF42VES MSZ EF50VES SYMBOL NAME FUSE Fll 15A 250V r TB m Ee ourooor 1 eri of MF FAN MOTOR 1 1 UNIT BWL igo LL M miy erk VANE MOTOR 12 24V zzz RED 1 WIT 5 HORIZONTAL 53 or LU YLW 2 NR11 VARISTOR Dr BLU oo X ATLL ROOM TEMP F BLK THERMISTOR LS INDOOR POWER RTI COIL TEMP BOARD Dig 77 THERMISTOR MAIN BEEN COIL TEMP Sees RT13 THERMISTOR SUB 02 CN151 INDOOR ELE
7. Wait for 2 or more minutes after the main power supply is turned on Touch S2 and S3 with tester probes and start the emergency operation Y When the emergency operation starts does the rated voltage occur for 2 gt No seconds between indoor terminal block S2 and S3 Y pes Turn the main power supply OFF Does the indoor OPERATION No Y INDICATOR lamp left blink No T continuously 6 minutes after the Does the outdoor LED light up ae the main power supply emergency operation starts Y Yes Y Yes Confirm that the thermostat is OFF Wait for 2 or more minutes after the main power sup and wiring is not loose ply is turned ON Touch CN202 and JPG with tester probes and start the emergency operation Y Y Does the outdoor LED blink 6 No times Po Replace the outdoor inverter P C board X1 During the emergency operation does DC 2V or more occur for 2 No Yes seconds between CN202 and Does DC 6V or more occur Na id on na noor electronic control between indoor terminal block S2 Replace the outdoor inverter P C board 1 board and S3 y Yes Yes Replace the Replace the x1 indoor power P C indoor electronic Turn the main power supply OFF Electric charge may remain immediately board control P C board Replace the indoor power P C aft
8. E m m 2 m 2 MSZ EF25VEQS MSZ EF50VE2S 3 3 3 3 2 Outdoor unit service manual MUZ EF VE H Series OBH590 MXZ D VA Series OBH626 MXZ C VA Series OB584 MSZ EF VEW MSZ EF VEB MSZ EF VES MXZ 8B Series OCH480 CONTENTS 1 TECHNICAL CHANGES 3 2 PART NAMES AND 4 3 SPECIFICATION 2 eee 6 NOISE CRITERIA CURVES 8 5 OUTLINES AND DIMENSIONS 10 6 WIRING 1 12 7 REFRIGERANT SYSTEM DIAGRAM 13 8 SERVICE FUNCTIONS 14 9 MICROPROCESSOR CONTROL 16 10 TROUBLESHOOTING ern 24 11 DISASSEMBLY INSTRUCTIONS 38 PARTS CATALOG OBB589 NOTE RoHS compliant products have G mark on the spec name plate C Use the specified refrigerant only Never use any refrigerant other than that specified Doing so may cause a burst an explosion or fire when the unit is being used serviced or disposed of Correct refrigerant is specified in the manuals and on the spec labels provided with our products We will not be held responsible for mechanical failure system malfunctio
9. Yes Replace the indoor elec tronic control P C board No 34 Electromagnetic noise enters into sets radios No Earth the unit lt Is the unit earthed Yes Is the distance between the antennas and the indoor unit within 3 m or is the distance between the antennas and the Yes outdoor unit within 3 No Extend the distance between the antennas and the indoor unit and or the antennas and the outdoor unit Is the distance between the TV sets or radios and the indoor unit within 1 m or is the distance between the TV sets or Yes radios and the outdoor unit within 3 m No Extend the distance between the TV sets and or radios and the indoor unit or the TV sets or radios and the outdoor unit Are the antennas damaged Is the coaxial cable damaged Replace or repair the antenna Is there any poor contact in the anten Yes Replace or repair the coaxial cable na wiring i Is the indoor outdoor connecting wire Extend the distance between the indoor outdoor of the air conditioner and the wiring of connecting wire of the air conditioner and the the antennas close Yes ing of the antennas Even if all of the above conditions are fulfilled the electromagnetic noise may enter depending on the electric field strength or the installation condition combination of specific conditions such as a
10. ry Blinking Not lighted Abnormal point Operation indicator lamp Symptom Condition Remedy Left lamp flashes 0 5 second ON Miswiring or serial signal 0 5 second OFF Left lamp flashes Indoor coil 2 time flash thermistor 0 0000080800 PI Room tem perature thermistor 2 5 second OFF Left lamp flashes 3 time flash Indoor fan o osocooosososooo pa motor 2 2 5 second OFF Left lamp flashes 4 time flash n RED 0808 08000008080 trol system AEE 2 5 second OFF 208 Indoor unit and outdoor unit do not operate Left lamp flashes 5 time flash Outdoor power sys tem 2 5 second OFF Left lamp flashes 6 time flash Outdoor thermistors ROR 2 5 second OFF Left lamp flashes 7 time flash Outdoor D D D w PN V 47 D control sys eoeoceoeoeoeoeoooooe tem L 2 5 second OFF Left lamp flashes 14 time flash or more Other ab normality 2 5 second OFF The serial signal from the outdoor unit is not received for 6 minutes The indoor unit is connected to a low stand by power model after once connected to a non low standby power model Refer to 10 6 How to check miswiring and serial signal er ror Refer to NOTE The indoor coil or the room temperature ther mistor is short or open circu
11. Remedy Not lighted Normal 1 time flash every 0 5 second Room temperature thermistor The room temperature thermistor short or open circuit is detected every 8 seconds dur ing operation Refer to the characteristics of the room temperature thermistor 10 7 2 time flash 2 5 second OFF Indoor coil thermistor The indoor coil thermistor short or open circuit is detected every 8 seconds during operation Refer to the characteristics of the main indoor coil ther mistor the sub indoor coil thermistor 10 7 3 time flash 2 5 second OFF Serial signal The serial signal from outdoor unit is not re ceived for a maximum of 6 minutes Refer to 10 6 How to check miswiring and serial signal error 11 time flash 2 5 second OFF Indoor fan motor The rotational frequency feedback signal is not emitted for the 12 seconds after the indoor fan motor is operated Refer to 10 6 9 Check of indoor fan motor 12 time flash 2 5 second OFF Indoor control System It cannot properly read data in the nonvolatile memory of the indoor electronic control P C board Replace the indoor electronic control P C board NOTE Blinking patterns of this mode differ from the ones of TROUBLESHOOTING CHECK TABLE 10 4 OBH589D 26 10 3 INSTRUCTION OF TROUBLESHOOTING Indoor unit operates Outdoor unit does not operate normally Indo
12. Display board Switch board MSZ EF18VEW MSZ EF22VEW MSZ EF25VEW MSZ EF35VEW MSZ EF42VEW MSZ EF50VEW MSZ EF18VEB MSZ EF22VEB MSZ EF25VEB MSZ EF35VEB MSZ EF42VEB MSZ EF50VEB MSZ EF18VES MSZ EF22VES MSZ EF25VES MSZ EF35VES MSZ EF42VES MSZ EF50VES Indoor power P C board Fuse F11 Varistor NR11 Indoor fan motor CN211 Connector to terminal 5 325 Ve block CN201 GND high voltage DC 15 VDC 3 6 VDC Connector to indoor 0 or 15 VDC electronic control P C board CN202 Reactor L111 O Room temperature thermistor RT11 Indoor coil thermistor RT12 RT13 Connector to power 40 77 J P C board CN102 NN 12 lt A a2 SSS 8 o LE 34 sp SSS C eed O 5 VDC A e WS s e L Indoor electronic control P C board Receiver board pa Resistance kQ Vane motor CN151 0 1020 30 40 50 60 Temperature C Display board 4 pe 8 9 is mj i iiie OFOFOFOFOFO Room temperature ther eM er eto mistor RT11 CN111 oe Timer short mode To disable Auto restart function Switch board mistor RT12 point JPG JPS Refer I RT13 CN112 to 8 1 solder the Jumper wire to JR07 8 4 Emergency opera
13. Last setting will be stored after the unit is turned OFF with the remote controller Indoor unit receives the signal of the remote controller with beeps INDOOR UNIT DISPLAY SECTION Operation Indicator lamp The operation indicator at the right side of the indoor unit indicates the operation state The following indication applies regardless of shape of the indication Indication Operation state Room temperature The unit is operating to About 2 C or more away SOR aS reach the set temperature set temperature Lighted XX Blinking The room temperature is o About 1 to 2 C from set approaching the set tem temperature O Not lighted perature Standby mode Only during multi system operation 17 OBH589D 9 1 COOL OPERATION 1 Press OPERATE STOP ON OFF button OPERATION INDICATOR lamp of the indoor unit turns on with a beep tone 2 Select COOL mode with OPERATION SELECT button 3 Press TEMPERATURE buttons TEMP or button to select the desired temperature The setting range is 16 31 C 1 Coil frost prevention The compressor operational frequency is controlled by the temperature of the indoor heat exchanger to prevent the coil from frosting When the temperature of indoor heat exchanger becomes too low the coil frost prevention mode works The indoor fan operates at the set speed and the compressor stops This mode continues until the temp
14. Release the failure mode recall function according to Releasing the failure mode recall function mentioned above NOTE 1 Make sure to release the failure mode recall function after it is set up otherwise the unit cannot operate properly 2 If the abnormal condition is not deleted from the memory the last abnormal condition is kept memorized X2 Blinking pattern when the indoor unit is abnormal X4 The information regarding whether the connected outdoor unit is a low standby power model or a non low standby power model will also be initialized Default compatible with low standby power model Blinking at 0 5 Blinking at 0 5 lt 5 OFE interval lt 5 OFF interval UU SS ag ye OFF lt lt lt lt Beeps Beeps 5 Repeated cycle Repeated cycle Repeated cycle 3X3 Blinking pattern when the outdoor unit is abnormal Pas Blinking at 0 5 Blinking at 0 5 i second interval lt second OFF a 3 second ON Ls second interval gt 5 second OFF a 3 second ON pie gt a OFF lt gt lt lt No beep gt No beep gt Repeated cycle Repeated cycle Repeated cycle OBH589D 2 Indoor unit failure mode table The left lamp of OPERATION INDI CATOR lamp Abnormal point Failure mode Condition
15. 6i BK THERMISTOR INDOOR POWER T Tio COIL TEMP CN202 BOARD 10106 77 RT12 THERMISTOR MAIN ae St COIL TEMP 5 RT13 THERMISTOR SUB 1011015 e FFS ow enisi H T111 TRANSFORMER DISPLAY INDOOR ELECTRONIC BOARD ONTROL P C BOARD L BLO MCN 2 MV CN112 0105 Q e RELAY NOTES 1 the outdoor side electronic wiring LD120 5 1 0012000 i foo r to the outdoor unit electronic wiring RECEIVER MEE Qu for servicing BOARD 3 3 LD105 5 19 Use copper conductors only PIX QT SWITCH BOARD For field wiring Terminal block 77 Symbols indicate Connector OBH589D 7 REFRIGERANT SYSTEM DIAGRAM MSZ EF18VEW MSZ EF22VEW MSZ EF25VEW MSZ EF35VEW MSZ EF42VEW MSZ EF50VEW MSZ EF18VEB MSZ EF22VEB MSZ EF25VEB MSZ EF35VEB MSZ EF42VEB MSZ EF50VEB MSZ EF18VES MSZ EF22VES MSZ EF25VES MSZ EF35VES MSZ EF42VES MSZ EF50VES MSZ EF18VE2W MSZ EF22VE2W MSZ EF25VE2W MSZ EF35VE2W MSZ EF42VE2W MSZ EF50VE2W MSZ EF18VE2B MSZ EF22VE2B MSZ EF25VE2B MSZ EF35VE2B MSZ EF42VE2B MSZ EF50VE2B MSZ EF18VE2S MSZ EF22VE2S MSZ EF25VE2S MSZ EF35VE2S MSZ EF42VE2S MSZ EF50VE2S OBH589D Unit mm Refrigerant pipe 29 52 MSZ EF18 22 25 35 42 912 7 MSZ EF50 with heat insulator Indoor coil thermistor RT12 main Flared connection Indoor coil thermistor RT13 sub Room tempera
16. C Outdoor Dry bulb temperature 7 C Wet bulb temperature 6 C 1 Measured under rated operating frequency Specifications and rated conditions of main electric parts Fuse T3 15AL250V Horizontal vane motor 12 VDC Varistor S10K300E2K1 ERZV10D471 Terminal block 3P OBH589D 4 NOISE CRITERIA CURVES MSZ EF18VEW MSZ EF22VEW MSZ EF25VEW MSZ EF18VEB MSZ EF22VEB MSZ EF25VEB MSZ EF18VES MSZ EF22VES MSZ EF25VES MSZ EF18VE2W MSZ EF22VE2W MSZ EF25VE2W MSZ EF18VE2B MSZ EF22VE2B MSZ EF25VE2B MSZ EF18VE2S MSZ EF22VE2S MSZ EF25VE2S FAN SPEED FUNCTION SPL dB A LINE COOLING 42 oe Super High HEATING 45 o O 90 r lt e m i 80 i z x a T Fo m F F 70 i Bx i am T T Qu LIO 5 60 i E a g T i 8 gt x 40 a z gt 9 so a z lt 20 lt o 10 63 125 250 500 1000 2000 4000 8000 BAND CENTER FREQUENCIES Hz OBH589D OCTAVE BAND SOUND PRESSURE LEVEL dB re 0 0002 MICRO BAR 90 80 70 60 50 40 30 20 MSZ EF35VEW MSZ EF35VEB MSZ EF35VES MSZ EF35VE2W MSZ EF35VE2B MSZ EF35VE2S SPEED FUNCTION SPL dB A LINE COOLING 42 Super High
17. HEATING 46 NC 70 NC 60 r i NC 10 BAND CENTER FREQUENCIES Hz 63 125 250 500 1000 200 4000 8000 MSZ EF42VEW MSZ EF50VEW MSZ EF42VEB MSZ EF50VEB MSZ EF42VES MSZ EF50VES MSZ EF42VE2W MSZ EF50VE2W MSZ EF42VE2B MSZ EF50VE2B MSZ EF42VE2S MSZ EF50VE2S FAN SPEED FUNCTION SPL dB A LINE FAN SPEED FUNCTION SPL dB A LINE COOLING 42 ee COOLING 43 HEATING 48 o o HEATING 49 90 1 I I 1 5 90 I 1 c 1 I T 3 1 14 F 9 3 8 a d E PO d r S 7 TENE TENE z z Tt TEE S 70 7 Neo L 70 a m 1 AM A 5 60 9 t NC 60 y H 50 50 J i 8 N I o o 40 40 cme 9 1 2 gt 2 9 3 a 9 2 2 2 u 20 u 20 TEN NC 10 Eu o 10 1 F E 10 i 1 F F 63 1275 250 500 1000 2000 4000 8000 63 1
18. OPERATE STOP ON OFF button Temperature buttons RESET button CLOCK SET button Indication of remote controller model is on back NOTE Last setting will be stored after the unit is turned OFF with the remote controller Indoor unit receives the signal of the remote controller with beeps OBH589D MSZ EF18VE2W MSZ EF22VE2W MSZ EF25VE2W MSZ EF35VE2W MSZ EF42VE2W MSZ EF50VE2W MSZ EF18VE2B MSZ EF22VE2B MSZ EF25VE2B MSZ EF35VE2B MSZ EF42VE2B MSZ EF50VE2B MSZ EF18VE2S MSZ EF22VE2S MSZ EF25VE2S MSZ EF35VE2S MSZ EF42VE2S MSZ EF50VE2S MEE Signal transmitting section MITSUBISHI ELECTRIC MOSS AF sa s Operation display section 1 1 Li zi OPERATION SELECT button ECONO COOL VANE DID XI El Mon Tue Wed Thu Fri Sat Sun ECONO COOL button 1594 9o Dn pun isave 123489 DL OON TEMP OON OFF TIMER C WEEKLY TIMER 1 Temperature buttons SET s FAN SPEED CONTROL button VANE CONTROL button TIME TIMER set buttons x FORWARD button BACKWARD button remote controller model is on back OPERATE STOP o Om WEEKLY TIMER set button ON OFF button 1 TIME TEMP DELETE v v CLOCK RESET RESET button Indication of CLOCK SET button NOTE
19. Remove batteries before modification The board has a print as shown below NOTE For modification take out the batteries and press the OPERATE STOP ON OFF button 2 or 3 times at first After modification put back the batteries then press the RESET button 107076 NIPPON SEIKI CO LTD L MD 0396 001 94 0 i 0 O Ta ea 2 BAT Lo JPI The P C board has the print J1 and J2 Solder J1 and J2 according to the number of indoor unit as shown in Table 1 After modification press the RESET button Table 1 1 unit operation 2 units operation 3 units operation 4 units operation No 1 unit No modification Same as at left Same as at left Same as at left No 2 unit Solder J1 Same as at left Same as at left No 3 unit Solder J2 Same as at left No 4 unit Solder both J1 and J2 How to set the remote controller exclusively for particular indoor unit After you turn the breaker ON the first remote controller that sends the signal to the indoor unit will be regarded as the remote controller for the indoor unit The indoor unit will only accept the signal from the remote controller that has been assigned to the indoor unit once they are set The setting will be cancelled if the breaker is turned OFF or the power supply is shut down Please conduct the above setting once again after the power has restored OBH589D t
20. Setting up the failure mode recall function Turn the power supply lt Preparation of the remote controller gt While pressing both OPERATION SELECT button and TEMP button on the remote controller at the same time press RESET button First release RESET button Hold down the other two buttons for another 3 seconds Make sure that the indicators on the LCD screen shown in the right figure are all displayed Then release the but tons Press OPERATE STOP ON OFF button of the remote controller the set temperature is displayed with the remote controller headed towards the indoor unit X1 X1 Regardless of normal or abnormal condition a short beep is emitted once the signal is ser i CEER Men Tue Wed received 123489 OOFFLIDI Does left lamp of OPERATION INDICATOR lamp on the indoor unit blink at the interval of 0 5 Indoor unit is normal seconds But the outdoor unit might be abnormal because there are some abnor Blinks Either indoor or outdoor unit is abnormal No malities that can not be recalled with this way Ps 9f OPERATION OFF Check if outdoor unit is abnormal according to the detailed outdoor unit INDICATOR lamp 3X2 failure mode recall function Yes Judgment of indoor outdoor abnormality w Blinks Before blinking does the left lamp of OPERATION INDICATOR lamp stay ON for 3 NOTE It
21. When OPERATE STOP button is pressed POWER OFF b When the operation is stopped by the emergency operation c When ON TIMER is ON standby 6 Dew prevention During COOL or DRY operation with the vane angle at Angle 4 or 5 when the compressor cumulative operation time exceeds 1 hour the vane angle automatically changes to Angle 1 for dew prevention 7 SWING 3 mode By selecting SWING mode with VANE CONTROL button the horizontal vanes swing vertically When COOL DRY or FAN mode is selected only the upper vane swings 8 Cold air prevention in HEAT operation The horizontal vane position is set to Upward NOTE When 2 or more indoor units are operated with multi outdoor unit even if any indoor unit turns thermostat off this control does not work in the indoor unit OBH589D S 9 ECONO COOL Zi operation ECONOmical operation When ECONO COOL button is pressed in COOL mode set temperature is automatically set 2 C higher by micro processor However the temperature on the LCD screen on the remote controller is not changed Also the horizontal vane swings in various cycle SWING operation makes you feel cooler than set temperature So even though the set temperature is higher the air conditioner can keep comfort As a result energy can be saved To cancel this operation select a different mode or press one of the following buttons in ECONO COOL operation ECONO COOL or VANE CONTROL button 9 7 TIMER O
22. board switch No Replace the varistor NR11 and fuse F11 X3 Yes Is the varistor NR11 burnt and the fuse F11 blown No Turn OFF the power supply Check both parts side and pattern Be sure to check both the fuse side of the indoor power P C board and the varistor in any case visually Is the fuse F11 blown only No Yes X1 The fan motor connector s lead wire is red whereas 0 is black Measure the resistance between X2 Connect of the tester to fan motor connector s CN211 and of indoor fan C lead wire and to lead wire otherwise the motor connector X1 2 resistance cannot be measured properly X3 Please replace the fuse after removing the indoor power P C board from the electrical box Y Replace fuse F11 and the Is the resistance 1MQ or more No indoor fan motor X3 Yes Replace the fuse F11 X3 Measure the resistance of reactor Is the resistance of reactor Replace the indoor L111 on the indoor power P C Eri approximately 2 2 Q power P C board and board the indoor fan motor i Is the 5 VDC between 5 V and JPG GND of the indoor electronic control P C board Indoor power Fuse F11 vision between IP V r and JPG GND Ly eplace the indoor fan motor P C board NR11 ihe indoor electronic control P
23. button 3 Press TEMPERATURE buttons TEMP or button to select the desired temperature The setting range is 16 31 C 1 Cold air prevention control When the compressor is not operating or is starting and the temperature of indoor heat exchanger and or the room tem perature is low or when defrosting is being done the indoor fan will stop or rotate in Very Low speed 2 High pressure protection The compressor operational frequency is controlled by the temperature of the indoor heat exchanger to prevent the con densing pressure from increasing excessively When the temperature of indoor heat exchanger becomes too high the high pressure protection works The indoor fan operates following the cold air prevention control This mode continues until the temperature of indoor heat exchanger falls 3 Defrosting Defrosting starts when the temperature of outdoor heat exchanger becomes too low The compressor stops once the indoor outdoor fans stop the 4 way valve reverses and the compressor re starts This mode continues until the temperature of outdoor heat exchanger rises or the fixed time passes 9 5 AUTO CHANGE OVER AUTO MODE OPERATION Once desired temperature is set unit operation is switched automatically between COOL and HEAT operation Mode selection 1 Initial mode When unit starts the operation with AUTO operation from OFF If the room temperature is higher than the set temperature operation starts in COOL mode If the r
24. button to complete and transmit the weekly timer setting TEST Mon Tue Wed Thu Fri Sat Sun which was blink ing goes out and the 12 7171 current time will be displayed NOTE Press button to transmit the setting information of weekly timer to the indoor unit Point the remote controller toward the indoor unit for 3 seconds When setting the timer for more than one day of the week or one number button does not have to be pressed per each setting Press button once after all the settings are complete All the weekly timer settings will be saved Press button to enter the weekly timer setting mode and press and hold button for 5 seconds to erase all weekly timer settings Point the remote controller toward the indoor unit WEEKLY 5b Press button to turn the weekly timer ON lights When the weekly timer is ON the day of the week whose timer setting is complete will light WEEKLY Press button again to turn the weekly timer OFF goes out NOTE The saved settings will not be cleared when the weekly timer is turned OFF 2 Checking weekly timer setting EDIT SEND 1 Press button to enter the weekly timer setting mode blinks 2 Press or buttons to view the setting of the particular day or number 3 Press button to exit the weekly timer setting NOTE When all days of the week are selected to view the settings and a different setting is inc
25. counter measures are required to prevent the main voltage drop or the rush of the starting current by adding to the system that allows the units to start one by one OBH589D 9 MICROPROCESSOR CONTROL MSZ EF18VEW MSZ EF22VEW MSZ EF25VEW MSZ EF18VEB MSZ EF22VEB MSZ EF25VEB MSZ EF18VES MSZ EF22VES MSZ EF25VES MSZ EF18VE2W MSZ EF22VE2W MSZ EF25VE2W MSZ EF18VE2B MSZ EF22VE2B MSZ EF25VE2B MSZ EF18VE2S MSZ EF22VE2S MSZ EF25VE2S MSZ EF35VEW MSZ EF35VEB MSZ EF35VES MSZ EF35VE2W MSZ EF35VE2B MSZ EF35VE2S MSZ EF42VEW MSZ EF50VEW MSZ EF42VEB MSZ EF42VES MSZ EF42VE2W MSZ EF42VE2B MSZ EF42VE2S MSZ EF50VEB MSZ EF50VES MSZ EF50VE2W MSZ EF50VE2B MSZ EF50VE2S WIRELESS REMOTE CONTROLLER MSZ EF18VEW MSZ EF22VEW _ MSZ EF25VEW MSZ EF18VEB MSZ EF22VEB MSZ EF25VEB MSZ EF18VES MSZ EF22VES MSZ EF25VES em Signal transmitting section 19 9 a C MSZ EF50VEW MSZ EF50VEB MSZ EF50VES MSZ EF35VEW MSZ EF42VEW MSZ EF35VEB MSZ EF42VEB MSZ EF35VES MSZ EF42VES SPEED CONTROL button VANE CONTROL button OPERATION SELECT button Wen Tue Wed Tha Fri Sat Sin ECONO COOL button SET 1234 LILI 98 8 TIME TIMER set buttons FORWARD button BACKWARD button x WEEKLY TIMER I set button
26. electrical box 1 Remove the panel Refer to 1 and the corner box right 2 Remove the screw of the V A clamp Remove the V A clamp and the indoor outdoor connecting wire 3 Remove the earth wire connected to the indoor heat Screw of exchanger from the electrical box a the electrical cover Earth wire Electrical box 4 Remove the screw of the electrical cover and remove the electrical cover 5 Disconnect following connectors lt Indoor electronic control P C board gt CN151 Vane motor lt Indoor power P C board gt CN211 Indoor fan motor j 6 Remove the screw fixing the electrical box then mie holder the upper catch of the electrical box and pull out the electrical box Catch of indoor electronic control P C board holder Photo 3 Upper catch Screw of Earth wire the terminal block Removing the indoor power P C board the E Indoor power switch board the display board the receiver GN P C board board and the indoor electronic control P C lg board Indoor electronic 1 Remove the panel Refer to 1 and the corner box MI 5 control P C board right 2 Remove the screw of the V A clamp Remove the V A clamp and the indoor outdoor connecting wire 3 Remove the indoor electrical box Refer to 2 4 Remove the earth wire connected to the electrical box from the indoor power P C board 5 Disconnect the fol
27. error indicated 6 minutes later No disconnection of the Yes indoor outdoor connect Yes ing wire No lt y X1 Miswiring may damage indoor electronic control Y board during the operation Turn OFF the power supply Check once more if the indoor outdoor connecting wire is not miswiring Remove the indoor outdoor connecting wire from outdoor terminal block S3 Bridge the outdoor terminal block S2 and S3 x1 Be sure to confirm the wiring is correct before the opera tion starts X3 Be sure to check this within 3 minutes after turning ON After 3 minutes LED blinks 6 times Even when the inverter P C board or the outdoor electronic control P C Y power supply Y Turn ON the board is normal LED blinks 6 times after 3 minutes Except for outdoor unit of multi system type Is bus bar voltage of the inverter board the outdoor electronic control Refer to TEST POINT DIAGRAM AND VOLTAGE of the outdoor unit P C board normal No Check of power supply Yes Y Does the LED the inverter board or the outdoor electronic control board repeat 3 6 second OFF and 0 8 second ON quick blinking X3 Yes Turn OFF the power supply Turn ON the power supply Remove the bridge between outdoor terminal block S2 and S3 Connect the indoor outdoor connecting wire to outdoor terminal block 83 Y Is there r
28. in the nonvolatile memory of the inverter P C board or the out door electronic control P C board Check the blinking pattern of the LED on the inverter P C board or the outdoor electronic control P C board NOTE The indoor unit may have been connected to a non low standby power model outdoor unit To use a low standby power model clear the error history by referring to Deleting the memorized abnormal condition described in 10 2 1 When the error history is being cleared the connection information also will be initialized The indoor unit will be compatible with a low standby power model after initialization If the operation indicator lamp continues to flash as shown in No 1 after the procedure refer to 10 6 How to check miswiring and serial error OBH589D 28 OPERATION INDICATOR Uu Abnormal point Operation indicator lamp Symptom Condition Remedy Left lamp lights and lower lamp flashes The operation mode of the each indoor unit is differently set to COOL includes DRY and Unify the operation mode HEAT at the same time the operation mode Refer to outdoor unit service of the indoor unit that has operated at first has manual the priority MXZ type Outdoor unit Operation 000oosooooos operates but mode 2 5 second OFF indoor unit does setting J not operate 10 5 TROUBLE CRITERION OF MAIN PARTS MSZ EF18VEW MSZ EF22VEW MSZ EF25VEW MSZ EF35VEW MS
29. priority over the weekly timer the weekly timer operation will start again after the simple ON OFF timer is complete When the weekly timer is set temperature cannot be set to 10 C The weekly timer operation and i save operation cannot be used together 1 How to set the weekly timer Make sure that the current time and day are set correctly 1 Press button to enter the weekly timer setting mode 05500 blinks 1 2 Press and buttons to select setting day and number E g Mon Tue Sun and 1 are selected 1300 Mon Tue Wed Thu Fri Sat Sun SET 1 1 Pressing selects the setting number aes Pressing selects the day of the week to be set C Mon gt Tue gt Wed gt Thu gt Fri Sat gt Mon Tue Wed Thu Fri Sat Sun x All days can be selected 3 Press buttons to set ON OFF time and temperature MAW Mon Tue Wed Thu Fri Sat Sun CSET u E g ON 6 00 1 99 5 00 24 selected Pressing selects ON OFF timer A OON Gor Pressing TIME Pressing TEMP m adjusts the time adjusts the tem Pressing DELETE i erature deletes timer setting Hold down the button to change the time quickly Press and buttons to continue setting the timer for other days and or numbers OBH589D 4 55
30. takes up to 1 minute to indicate the outdoor unit abnormality Even if the OPERATION INDICATOR lamp is not lighting keep checking at least 1 minute or longer seconds Stays ON for 3 seconds without beep Yes The outdoor unit is abnormal No Y The outdoor unit is abnormal The indoor unit is abnormal Check the blinking pattern and identify the abnormal point by referring Check the blinking pattern and identify the abnormal point by referring to the to the outdoor unit failure mode table Refer to outdoor unit service indoor unit failure mode table Refer to 10 2 2 manual Make sure to check at least two consecutive blinking cycles 2 Make sure to check at least two consecutive blinking cycles X3 Releasing the failure mode recall function Y Release the failure mode recall function by the following procedures Turn OFF the power supply and turn it ON again Press RESET button of the remote controller Y Repair the failure parts Deleting the memorized abnormal condition CD After repairing the unit recall the failure mode again according to Setting up the failure mode recall unction mentioned above Press OPERATE STOP ON OFF button of the remote controller the set temperature is displayed with the remote controller headed towards the indoor unit 3 Press EMERGENCY OPERATION switch so that the memorized abnormal condition is deleted 4
31. to EMERGENCY COOL HEAT MODE with a set temperature of 24 C The fan speed shifts to Med The coil frost prevention works even in the test run or the emergency operation In the test run or emergency operation the horizontal vane operates in VANE AUTO mode Emergency operation continues until EMERGENCY OPERATION switch is pressed once or twice or the unit receives any signal from the remote controller In the latter case normal operation will start NOTE Do not press EMERGENCY OPERATION switch during normal operation Emergency operation switch SW 9 11 3 MINUTE TIME DELAY OPERATION Operation mode COOL HEAT Set temperature 24 C Fan speed Med Horizontal vane Auto The operation mode is indicated by the Operation Indicator lamp as following Operation Indicator lamp EMERGENCY COOL 8 Lighted EMERGENCY HEAT O Not lighted STOP O When system turns OFF compressor will not for minutes as 3 minute time delay function operates to protect compressor from overload OBH589D M 10 TROUBLESHOOTING MSZ EF18VEW MSZ EF22VEW MSZ EF25VEW MSZ EF35VEW MSZ EF42VEW MSZ EF50VEW MSZ EF18VEB MSZ EF22VEB MSZ EF25VEB MSZ EF35VEB MSZ EF42VEB MSZ EF50VEB MSZ EF18VES MSZ EF22VES MSZ EF25VES MSZ EF35VES MSZ EF42VES MSZ EF50VES MSZ EF18VE2W MSZ EF22VE2W MSZ EF25VE2W MSZ EF35VE2W MSZ EF42VE2W MSZ EF50VE2W MSZ EF18VE2B MSZ EF22VE2B MS
32. 25 250 500 1000 2000 4000 8000 BAND CENTER FREQUENCIES Hz BAND CENTER FREQUENCIES Hz Test conditions INDOOR UNIT Cooling Dry bulb temperature 27 C WALL Wet bulb temperature 19 C im Heating Dry bulb temperature 20 0 8m MICROPHONE OBH589D 5 OUTLINES AND DIMENSIONS MSZ EF18VEW MSZ EF22VEW MSZ EF25VEW MSZ EF35VEW MSZ EF42VEW MSZ EF50VEW MSZ EF18VEB MSZ EF22VEB MSZ EF25VEB MSZ EF35VEB MSZ EF42VEB MSZ EF50VEB MSZ EF18VES MSZ EF22VES MSZ EF25VES MSZ EF35VES MSZ EF42VES MSZ EF50VES Unit mm 895 TT Air out Insulation 237 O D line 06 35 0 5 m Flared connection 26 35 09 52 0 43 m Flared connection 29 52 18 22 25 35 42 212 7 50 Drain hose Insulation 228 O D Connected part 216 O D Gas line OBH589D j MSZ EF18VE2W MSZ EF22VE2W MSZ EF25VE2W MSZ EF35VE2W MSZ EF42VE2W MSZ EF50VE2W MSZ EF18VE2B MSZ EF22VE2B MSZ EF25VE2B MSZ EF35VE2B MSZ EF42VE2B MSZ EF50VE2B MSZ EF18VE2S MSZ EF22VE2S MSZ EF25VE2S MSZ EF35VE2S MSZ EF42VE2S MSZ EF50VE2S Unit mm 11 26 Oblong hole 11 20 Oblong hole Installation plate 885 82 5 009 2231 4 82 5 g 380 358 64 5 gt Air in wall hole s65 u IL j j T
33. 25VE2B MSZ EF35VE2B MSZ EF42VE2B MSZ EF50VE2B MSZ EF18VE2S MSZ EF22VE2S MSZ EF25VE2S MSZ EF35VE2S MSZ EF42VE2S MSZ EF50VE2S Front panel Air filter Nano platinum filter Air cleaning filter Electrostatic anti allergy enzyme filter T lt 2 J SS t SS Horizontal vane 9 Emergency operation switch Heat exchanger es Operation A Remote control indicator lamp receiving section Remote controller ACCESSORIES MSZ EF18VE2W MSZ EF22VE2W MSZ EF25VE2W MSZ EF35VE2W MSZ EF18VE2B MSZ EF22VE2B MSZ EF25VE2B MSZ EF35VE2B MSZ EF18VE2S MSZ EF22VE2S MSZ EF25VE2S MSZ EF35VE2S MSZ EF42VE2W MSZ EF50VE2W MSZ EF42VE2B MSZ EF50VE2B MSZ EF42VE2S MSZ EF50VE2S Installation plate Installation plate fixing screw 4 x 25 mm Remote controller holder Fixing screw for 3 5 x 16 mm Black Battery AAA for remote controller Wireless remote controller Felt tape For left or left rear piping N NI I dh Oo Sa Soft dry cloth VEB type only Air cleaning filter OBH589D R 3 SPECIFICATION Indoor model MSZ EF18VEW MSZ EF18VEB MSZ EF18VES MSZ EF18VE2W MSZ EF18VE2B MSZ EF18VE2S MSZ EF22VEW MSZ EF22VEB MSZ EF22VES MSZ EF22VE2W MSZ EF22VE2B MSZ EF22VE2S MSZ EF25VEW MSZ EF25VEB MSZ EF25VES MSZ EF25VE2W MSZ EF25VE2B MSZ EF25V
34. 2VEB MSZ EF50VEB MSZ EF42VES MSZ EF50VES MSZ EF42VE2W MSZ EF50VE2W MSZ EF42VE2B MSZ EF50VE2B MSZ EF42VE2S MSZ EF50VE2S Indoor model Power supply Single phase 230 V 50 Hz Power input Cooling 14 18 1 Heating 31 34 Running Cooling 0 14 0 18 Electrical current 1 Heating 0 30 0 32 Model Cooling 0 14 0 18 Current 1 Fan Heating 0 30 0 32 Dimensions W x H x D 895 x 299 x 195 EF VEW B S 885 x 299 x 195 EF VE2W B S Weight 11 5 Air direction 5 Super High High Med Low Silent Super High High Med Low Silent Super High 42 43 High 39 40 Med 35 36 Low 31 33 Silent 28 30 Super High 48 49 High 41 43 Special remarks Sound level Med 35 37 Low 30 33 Silent 28 30 Super High 1 180 1 240 High 1 050 1 080 Med 930 950 Low 830 850 Silent Super High 1 400 1 440 Fan speed High 1 140 1 250 Med 940 1 060 Low 800 890 Silent 720 810 Fan speed regulator 5 Remote controller model SG11D EF VEW B S SG14D EF VE2W B S NOTE Test conditions are based on ISO 5151 Cooling Indoor Dry bulb temperature 27 Wet bulb temperature 19 Outdoor Dry bulb temperature 35 C Heating Indoor Dry bulb temperature 20
35. CTRONIC ROL P C BOARD I B TERMINAL BLOCK 2 12 10105 0 NOTES 1 put the out 0 Side electric wiring 101103 LD120 M refer to the outdoor unit electric wiring 4 diagram for servicing if 2 66 copper conductors only 10 111 TRANSFORMER MV OFJO 73 110105 S field wiring SWITCH BOARD 3 Symbols indicate Terminal block 0059 Connector MSZ EF18VE2W MSZ EF22VE2W MSZ EF25VE2W MSZ EF35VE2W MSZ EF42VE2W MSZ EF50VE2W MSZ EF18VE2B MSZ EF22VE2B MSZ EF25VE2B MSZ EF35VE2B MSZ EF42VE2B MSZ EF50VE2B MSZ EF18VE2S MSZ EF22VE2S MSZ EF25VE2S MSZ EF35VE2S MSZ EF42VE2S MSZ EF50VE2S SYMBOL NAME FUSE FIL 15AL250v LN CI Fi Ht S PSU 3 Y 51 T ke FAN MOTOR T 1 10 go oL gt BLK VANE MOTOR 12 24V cg RED 1 o lir 5 HORIZONTAL EZ ara os erc 3 ve VU VARISTOR ei ati ROOM TEMP ue
36. E2S MSZ EF35VEW MSZ EF35VEB MSZ EF35VES MSZ EF35VE2W MSZ EF35VE2B MSZ EF35VE2S Power supply Single phase 230 V 50 Hz Power input Cooling 14 1 Heating 27 Running Cooling 0 14 current Heating Model RC0J40 Cooling 0 14 Heating 0 26 0 30 Dimensions W x Hx D 895 299 x 195 EF VEW B S 885 x 299 x 195 EF VE2W B S Weight 11 5 Air direction 5 Super High 630 High 498 Med 378 Low 276 Silent 240 Super High High 534 Med 372 Low 276 Silent 240 Super High 42 High 36 Med 29 Low Silent 21 Super High High Med Low 24 Silent 21 Super High 1 200 High 990 Med 800 Low 630 Silent 570 Super High High 1 050 Med 790 Low 630 Silent 570 Fan speed regulator 5 Remote controller model 56110 EF VEW B S SG14D EF VE2W B S NOTE Test conditions are based on ISO 5151 Cooling Indoor Dry bulb temperature 27 Wet bulb temperature 19 C Outdoor Dry bulb temperature 35 Heating Indoor gt Dry bulb temperature 20 Outdoor Dry bulb temperature 7 C Wet bulb temperature 6 C 1 Measured under rated operating frequency Electrical Fan Current 1 Special remarks Sound level Fan speed OBH589D j MSZ EF42VEW MSZ EF50VEW MSZ EF4
37. EF42VEB MSZ EF22VES MSZ EF42VES MSZ EF18VE2W MSZ EF22VE2W MSZ EF25VE2W MSZ EF35VE2W MSZ EF42VE2W MSZ EF50VE2W MSZ EF18VE2B MSZ EF22VE2B m m m m m m m E m MSZ EF25VE2B m MSZ EF35VE2B m MSZ EF42VE2B m MSZ EF50VE2B E MSZ EF18VE2S m MSZ EF22VE2S E MSZ EF25VE2S m MSZ EF35VE2S m MSZ EF42VE2S m MSZ EF50VE2S m 1 Front panel has been changed 2 Panel assembly has been changed 3 Remote controller has been changed MSZ EF18VE2W MSZ EF35VE2W MSZ EF18VE2B MSZ EF35VE2B MSZ EF18VE2S MSZ EF35VE2S 1 New model OBH589D MSZ EF22VE2W MSZ EF42VE2W MSZ EF22VE2B MSZ EF42VE2B MSZ EF22VE2S MSZ EF42VE2S MSZ EF25VEW MSZ EF50VEW MSZ EF25VEB MSZ EF50VEB MSZ EF25VES MSZ EF50VES m MSZ EF25VE2W MSZ EF50VE2W MSZ EF25VE2B MSZ EF50VE2B MSZ EF25VE2S MSZ EF50VE2S m a m 2 2 2 2
38. ER1 have been modified m 11 ER MSZ EF18 22 25 35 42 50VE2B m OBH589D x TECHNICAL CHANGES The following models are compatible with the outdoor units with low standby power control Connecting the following models to the MUZ EF VE H series outdoor units enables the low standby power control Refer to the technical guide OBT17 about the low standby power control The following models may be connected to the MUZ EF VE H series after once connected to the MXZ series and operated for example because of relocation In that case the MUZ EF VE H series outdoor units will not operate without taking a step Follow the procedure Deleting the memorized abnormal condition described in 10 2 1 MSZ EF18VEW MSZ EF35VEW MSZ EF18VEB MSZ EF35VEB MSZ EF18VES MSZ EF35VES 1 New model MSZ EF18VEW MSZ EF22VEW MSZ EF25VEW MSZ EF35VEW MSZ EF42VEW MSZ EF50VEW MSZ EF22VEW MSZ EF18VEB MSZ EF22VEB MSZ EF25VEB MSZ EF35VEB MSZ EF42VEB MSZ EF50VEB MSZ EF18VES MSZ EF22VES MSZ EF25VES MSZ EF35VES MSZ EF42VES MSZ EF50VES v V j j j j j lj j j E V V V V V MSZ EF42VEW MSZ EF22VEB MSZ
39. MITSUBISHI ELECTRIC SPLIT TYPE AIR CONDITIONERS INDOOR UNIT SERVICE MANUAL Models MSZ EF18VEW MSZ EF22VEW c MSZ EF25VEW MSZ EF35VEW MSZ EF42VEW MSZ EF50VEW MSZ EF18VEB MSZ EF22VEB c MSZ EF25VEB MSZ EF35VEB MSZ EF42VEB c MSZ EF50VEB MSZ EF18VES MSZ EF22VES c MSZ EF25VES c MSZ EF35VES MSZ EF42VES MSZ EF50VES c m 2 MSZ EF18VE2W m MSZ EF18VE2B MSZ EF35VE2B MSZ EF18VE2S MSZ EF35VE2S E m 2 2 MSZ EF22VE2W MSZ EF35VE2W MSZ EF42VE2W MSZ EF22VE2B MSZ EF42VE2B MSZ EF22VE2S c MSZ EF42VE2S Changes for the Better Revision D The descriptions of the dimensions for MSZ EF18 22 25 35 42 50VE2W E1 ER1 MSZ EF18 22 25 35 42 50VE2B 1 ER1 and 52 18 22 25 35 42 50 25 E1 have been modified Please void OBH589 REVISED EDITION C No OBH589 REVISED EDITION D m MSZ EF25VE2W MSZ EF50VE2W cem MSZ EF25VE2B MSZ EF50VE2B El m m m 2 m
40. PERATION 1 How to set the time 1 Check that the current time is set correctly NOTE Timer operation will not work without setting the current time Initially 0 00 blinks at the current time display of TIME MONITOR so set the current time correctly with CLOCK SET button How to set the current time a Press the CLOCK set button b Press the TIME SET buttons and to set the current time Each time FORWARD button is pressed the set time increases by 1 minute and each time BACKWARD button is pressed the set time decreases by 1 minute Pressing those buttons longer the set time increases decreases by 10 minutes c Press the CLOCK set button 2 Press OPERATE STOP ON OFF button to start the air conditioner 3 Set the time of timer ON timer setting a Press ON TIMER button Gon during operation b Set the time of the timer using TIME SET buttons and Cv x OFF timer setting a Press OFF TIMER button during operation b Set the time of the timer using TIME SET buttons and Cv x x Each time FORWARD button is pressed the set time increases by 10 minutes each time BACKWARD but ton is pressed the set time decreases by 10 minutes 2 To release the timer To release ON timer press ON TIMER button To release OFF timer press OFF TIMER button eor TIMER is cancelled and the display of set time disappears PROGRAM TIMER OFF t
41. Z EF25VE2B MSZ EF35VE2B MSZ EF42VE2B MSZ EF50VE2B MSZ EF18VE2S MSZ EF22VE2S MSZ EF25VE2S MSZ EF35VE2S MSZ EF42VE2S MSZ EF50VE2S 10 1 CAUTIONS ON TROUBLESHOOTING 1 Before troubleshooting check the following 1 Check the power supply voltage 2 Check the indoor outdoor connecting wire for miswiring 2 Take care of the following during servicing 1 Before servicing the air conditioner be sure to turn OFF the main unit first with the remote controller and then after confirming the horizontal vane is closed turn OFF the breaker and or disconnect the power plug 2 Be sure to turn OFF the power supply before removing the front panel the cabinet the top panel and the P C board 3 When removing the P C board hold the edge of the board with care NOT to apply stress on the components 4 When connecting or disconnecting the connectors hold the housing of the connector DO NOT pull the lead wires lt Incorrect gt lt Correct gt Lead wiring Housing point 3 Troubleshooting procedure 1 Check if the OPERATION INDICATOR lamp on the indoor unit is flashing ON and OFF to indicate an abnormality To make sure check how many times the OPERATION INDICATOR lamp is flashing ON and OFF before starting serv ice work 2 Before servicing check that the connector and terminal are connected properly 3 When the electronic control P C board seems to be defective check the copper foil pattern for dis
42. Z EF42VEW MSZ EF50VEW MSZ EF18VEB MSZ EF22VEB MSZ EF25VEB MSZ EF35VEB MSZ EF42VEB MSZ EF50VEB MSZ EF18VES MSZ EF22VES MSZ EF25VES MSZ EF35VES MSZ EF42VES MSZ EF50VES MSZ EF18VE2W MSZ EF22VE2W MSZ EF25VE2W MSZ EF35VE2W MSZ EF42VE2W MSZ EF50VE2W MSZ EF18VE2B MSZ EF22VE2B MSZ EF25VE2B MSZ EF35VE2B MSZ EF42VE2B MSZ EF50VE2B MSZ EF18VE2S MSZ EF22VE2S MSZ EF25VE2S MSZ EF35VE2S MSZ EF42VE2S MSZ EF50VE2S Part name Check method and criterion Figure Room temperature Measure the resistance with a tester thermistor RT11 Indoor coil thermistor Refer to 10 7 Test point diagram and voltage Indoor electronic control RT12 RT13 P C board for the chart of thermistor Indoor fan motor MF Check 10 6 Check of indoor fan motor Measure the resistance between the terminals with a tester Temperature 10 30 Color of the lead wire Normal RED BLK 232 2680 Vane motor MV BLK OBH589D 10 6 TROUBLESHOOTING FLOW A Check of indoor fan motor The indoor fan motor error has occurred and the indoor fan does not operate Turn OFF the power supply Pay enough attention to the high voltage on the fan motor connector CN211 EMERGENCY OPERATION switch Measure the supply voltage as follows within 12 seconds after EMER GENCY OPERATION switch is pressed If more than 12 seconds passes turn OFF the power supply and turn it Turn the power supply 5 s
43. ape of the terminal before detaching 1 Slide the sleeve and check if there is a locking lever or not 2 The terminal with this connector has the locking mechanism Slide the sleeve Hold the sleeve and Pull the terminal while pull out the terminal pushing the locking slowly 23 lever Connector MSZ EF18VEW MSZ EF22VEW MSZ EF25VEW MSZ EF35VEW MSZ EF42VEW MSZ EF50VEW MSZ EF18VEB MSZ EF22VEB MSZ EF25VEB MSZ EF35VEB MSZ EF42VEB MSZ EF50VEB MSZ EF18VES MSZ EF22VES MSZ EF25VES MSZ EF35VES MSZ EF42VES MSZ EF50VES MSZ EF18VE2W MSZ EF22VE2W MSZ EF25VE2W MSZ EF35VE2W MSZ EF42VE2W MSZ EF50VE2W MSZ EF18VE2B MSZ EF22VE2B MSZ EF25VE2B MSZ EF35VE2B MSZ EF42VE2B MSZ EF50VE2B MSZ EF18VE2S MSZ EF22VE2S MSZ EF25VE2S MSZ EF35VE2S MSZ EF42VE2S MSZ EF50VE2S NOTE Turn OFF power supply before disassembly OPERATING PROCEDURE PHOTOS 1 Removing the panel Photo 1 1 Remove the horizontal vanes 2 Remove the screw caps of the panel Remove the screws of the panel 3 Unhook the lower part of the panel 4 First hold the lower part of the right end of the panel and hold the lower part of the left end of the panel 5 Pull the panel slightly toward you and then remove the panel by pushing it upward Photo MSZ EF VES Front panel Horizontal vanes Screws of the panel Photo MSZ EF VE2B Front panel Horizontal vanes Screws of the panel OBH589D K OPERATING PROCEDURE PHOTOS 2 Remove the indoor
44. ated voltage between indoor terminal block S1 and S2 lt Confirmation of power voltage gt Yes and 53 lt Confirmation of serial signal gt Is there amplitude of 10 to 20 VDC between indoor terminal block S2 Replace the inverter board or the outdoor 2 electronic control Lighted or not Be careful of the residual voltage of smoothing lighted capacitor Check the wiring If there are any error of the indoor outdoor connecting wire such as the damage of the wire intermediate connection and or poor contact to the terminal block replace the indoor outdoor connecting wire No Turn OFF inverter controlled lighting equipment Turn OFF the power supply and then turn ON again Press EMERGENCY OPERATION Switch Reinstall either the unit or the light away from each other Attach a filter on remote control receiv ing section Is serial signal error indicated 6 minutes later of the indoor unit OBH589D Yes Y Is there 2 VDC or less between CN102 and JPG GND on the indoor electronic control P C board Yes No Is there 2 VDC or less between CN102 and JPG GND o board Is there 2 VDC or less between CN102 and JPG GND on the indoor electronic control P C board Yes No Replace the indoor power P C board n the indoor electronic control P C
45. connection and the components for bursting and discoloration 4 When troubleshooting Refer to 10 2 10 3 and 10 4 4 How to replace batteries Weak batteries may cause the remote controller malfunction In this case replace the batteries to operate the remote controller normally Remove the front lid and insert batteries Press RESET button with a thin instrument and Then reattach the front lid then use the remote controller Insert the negative pole of the batteries first Check if the polarity A of the batteries is correct RESET button NOTE 1 If RESET button is not pressed the remote controller may not operate correctly 2 This remote controller has a circuit to automatically reset the microcomputer when batteries are replaced This function is equipped to prevent the microcomputer from malfunctioning due to the voltage drop caused by the battery replacement 3 Do not use the leaking batteries OBH589D oe 10 2 FAILURE MODE RECALL FUNCTION Outline of the function This air conditioner can memorize the abnormal condition which has occurred once Even though LED indication listed on the troubleshooting check table 10 4 disappears the memorized failure details can be recalled 1 Flow chart of failure mode recall function for the indoor outdoor unit MSZ EF VEW B S MSZ EF VE2W B S Operational procedure The cause of abnormality cannot be found because the abnormality does not recur
46. econds or more and then press 15 there any foreign matter that interferes the rotation of the line flow fan No ON again then measure the voltage lt Indoor power P C board gt 1 Measure the voltage between CN211 and Yes 2 Measure the voltage between CN211 and lt Indoor electronic control P C board gt 3 Measure the voltage between CN102 and JPG GND R the forei tt 9 edm A X If more than 12 seconds passes after EMERGENCY OPERATION switch is pressed the voltage measured at 2 above goes 0 VDC although the indoor P C board is normal Does the voltage between CN211 Is there 325 VDC and on the power board I between CN211 Yes rise to the range of 3 to 6 VDC within Replace the indoor fan motor and 12 seconds after EMERGENCY OPERATION switch is pressed Does the voltage between CN102 and JPG on the indoor Replace the indoor power electronic control P C board fall to Replace the indoor electronic P C board Yes 2 V or less within 12 seconds after No control P C board EMERGENCY OPERATION switch is pressed The indoor fan motor error has occurred and the indoor fan repeats 12 second ON and 30 second OFF 3 times and then stops Measure the voltage CN102 Measure the voltage between CN211 lt and JPG GND on the indoor Is it unchanged
47. er has been cut the operation settings remain amp After the power is restored the unit restarts automatically according to the memory However it takes at least 3 minutes for the compressor to start running How to disable AUTO RESTART FUNCTION CD Turn off the main power for the unit Solder the jumper wire to JRO7 on the indoor electronic control P C board MSZ EF VEW B S Cut the jumper wire to JR77 on the indoor electronic control P C board MSZ EF VE2W B S Refer to 10 7 MSZ EF VEW B S MSZ EF VE2W B S Indoor electronic control P C board Indoor electronic control P C board JRO7 JR77 NOTE The operation settings are memorized when 10 seconds have passed after the indoor unit was operated with the remote controller If main power is turned OFF or a power failure occurs while AUTO START STOP timer is active the timer setting is can celled If the unit has been off with the remote controller before power failure the auto restart function does not work as the power button of the remote controller is OFF To prevent breaker OFF due to the rush of starting current systematize other home appliance not to turn ON at the same time When some air conditioners are connected to the same supply system if they are operated before power failure the starting current of all the compressors may flow simultaneously at restart Therefore the special
48. er the main power supply is turned OFF board Perform the procedure after 3 minutes Turn the main power supply ON Y Turn OFF inverter controlled lighting Start the emergency operation equipment Turn OFF the power supply and then turn ON again Does the indoor OPERATION LC er eee INDICATOR lamp left blink No Repair completed n continuously 6 minutes after the emergency operation starts Reinstall either the unit or the light away from Does DC 20V or more occur No Is serial signal each other between indoor terminal block S2 Replace the outdoor inverter board 1 error indicated 6 Attach a filter and 53 minutes later on remote Y Yes control ing section Replace the indoor electronic of the indoor control P C board unit OBH589D 2 turn OFF the power supply D Y Is there rated voltage in the power supply No Check the power supply y Yes Turn ON the power supply Y No Is there rated voltage between outdoor terminal block S1 and S2 Check the wiring yres Press EMERGENCY OPERATION switch once lamp light up lt Confirmation of the power to Y the left lamp of OPERATION INDICATOR the indoor unit gt No i Yes Y Is there any miswiring poor contact or wire Is serial signal
49. erature of indoor heat exchanger rises 2 Low outside temperature operation When the outside temperature is lower low outside temperature operation starts and the outdoor fan slows or stops 3 Indoor fan speed control When the thermostat turns OFF the indoor fan operates very Low to reduce power consumption When the room temperature rises and the thermostat is ON the indoor fan operates according to the settings on the remote controller 9 2 DRY A OPERATION 1 Press OPERATE STOP ON OFF button OPERATION INDICATOR lamp of the indoor unit turns on with a beep tone 2 Select DRY mode with OPERATION SELECT button 3 The set temperature is determined from the initial room temperature 1 Coil frost prevention Coil frost prevention works the same way as that in COOL mode 9 1 1 2 Low outside temperature operation Low outside temperature operation works the same way as that in COOL mode 9 1 2 3 Indoor fan speed control Indoor fan speed control works the same way as that in COOL mode 9 1 3 9 3 FAN 3 OPERATION 1 OPERATION INDICATOR lamp of the indoor unit turns on with a beep tone 2 Select FAN mode with OPERATION SELECT button 3 Select the desired fan speed When AUTO it becomes Low Only indoor fan operates Outdoor unit does not operate 9 4 HEAT 5 OPERATION 1 Press OPERATE STOP ON OFF button OPERATION INDICATOR lamp of the indoor unit turns on with a beep tone 2 Select HEAT mode with OPERATION SELECT
50. g the signal from the remote controller or may not be able to operate with it if the inverter fluorescent light is turned on when the room is warm the unit may be able to Turn ON a radio to AM and press OP operate with the remote controller Does the unit operate with the remote gt ERATE STOP ON OFF button on the controller No remote controller x 1 Yes Y Is noise heard from radio No Replace the remote controller Yes Y Are there any fluorescent lights of inverter or rapid start type within the unit away from lights range of 1 m x 2 Yes ttach a filter on receiving part No Replace the indoor electronic control P C board Including the receiver OBH589D Check of indoor board and indoor fan motor Turn OFF the power supply Remove indoor fan motor connector CN211 from indoor power P C board and vane motor connector CN151 from the indoor motor 1 electronic control board and turn ON Refer to 10 5 Replace the indoor fan motor the power supply Measure the resistance of indoor fan Short circuit Does the unit operate with the remote controller Measure the resistance of the vane Short circuit Does OPERATION INDICATOR lamp light gt motor coil Replace the vane motor and the indoor up by pressing EMERGENCY OPERATION Yes Refer to 10 5 electronic control P C
51. holding and while the fan motor is gt udin SI O or 15 VDC No electronic control P C board when Yes the fan motor is rotating Unchanged Replace the indoor fan motor Y Replace the indoor power P C lt Is it unchanged holding Replace the indoor elec board Yes 0 5 VDC tronic control board Unchanged Changed OBH589D d Check of remote controller and indoor electronic control board Check if the remote controller is exclusive for this air conditioner Press OPERATE STOP ON OFF button on the remote controller x 1 Look at the image of the signal transmitting section of the remote controller through the monitor of a digital Is LCD display on the remote controller camera or a camera phone It is normal if the LED of visible No Replace the batteries Refer to 10 1 4 the signal transmitting section lights up when the OP Not clear ERATE STOP ON OFF button on the remote control Yes ler is pressed However it may be difficult to see the illuminated LED of the signal transmitting section with Remove the batteries then set them back smartphone camera and press RESET button Refer to 10 1 4 Check if the unit operates with the remote 2 If the inverter fluorescent light is turned on when the controller room is cool the unit may have difficulty receivin
52. imer and ON timer can be used in combination The timer of the set time that is reached first will operate first 4 and display shows the order of OFF timer and ON timer operation Example 1 The current time is 8 00 PM Example 2 The current time is 11 00 AM The unit turns off at 11 00 PM and on at 6 00 AM The unit turns on at 5 00 PM and off at 9 00 PM Current Current ON ON ON OFF oa OFF OFF 6 00 29 mann enn UE LIU 11 DO OQ 6 NOTE If the main power is turned OFF or a power failure occurs while ON OFF timer is active the timer setting is celled As these models are equipped with an auto restart function the air conditioner starts operating with timer cancelled when power is restored OBH589D 9 8 WEEKLY TIMER OPERATION A maximum of 4 ON or OFF timers can be set for individual days of the week A maximum of 28 ON or OFF timers can be set for a week E g Runs at 24 C from waking up to leaving home and runs at 27 C from getting home to going to bed on weekdays Runs at 27 from waking up late to going bed early on weekends Mon Setting1 Setting2 Setting3 Setting4 ON OFF ON OFF 24 C 27 C 6 00 8 30 17 30 22 00 Setting1 Setting2 ON OFF 27 C Sun 8 00 21 00 NOTE The simple ON OFF timer setting is available while the weekly timer is on In this case the ON OFF timer has
53. it Refer to the characteristics of indoor coil thermistor and the room temperature thermistor 10 7 The rotational frequency feedback signal is not emitted during the indoor fan operation Refer to 10 6 Check of in door fan motor It cannot properly read data in the nonvolatile memory of the indoor electronic control P C board Replace the indoor electronic control P C board It consecutively occurs 3 times that the com pressor stops for overcurrent protection or start up failure protection within 1 minute after start up Refer to How to check of in verter compressor Refer to outdoor unit service manual Check the stop valve The outdoor thermistors short or open circuit during the compressor operation Refer to Check of outdoor thermistor Refer to outdoor unit service manual It cannot properly read data in the nonvolatile memory of the inverter P C board or the out door electronic control P C board Replace the inverter P C board or the outdoor electronic control P C board Refer to outdoor unit service manual An abnormality other than above mentioned is detected Check the stop valve Check the 4 way valve Confirm the abnormality in detail using the failure mode recall function for outdoor unit Outdoor control sys tem Outdoor unit does not oper ate Y Left lamp lights up It cannot properly read data
54. lowing connectors lt Indoor electronic power board gt CN201 Terminal block CN202 To the indoor electronic control P C board 6 Remove the indoor power P C board 7 Disconnect the following connectors lt Indoor electronic control P C board gt CN111 Room temperature thermistor CN112 Indoor coil thermistor 8 Unhook the catches of the display P C board holder from the nozzle and the electrical box right side 9 Open the rear cover of the display P C board holder and remove the switch board the display board and the receiver board Remove the indoor electronic control P C board the electrical box Catch of indoor electronic control P C board holder OBH589D OPERATING PROCEDURE PHOTOS 4 Removing the nozzle assembly Photo 4 1 Remove the panel Refer to 1 and the corner box right 2 Remove the indoor outdoor connecting wire Refer to 2 3 Remove the electrical cover Refer to 2 4 Disconnect the following connector lt Indoor electronic control P C board gt CN151 Vane motor 5 Remove the display P C board holder 6 Pull out the drain hose from the nozzle assembly and remove the nozzle assembly 7 Remove the vane motors Refer to 5 Screws of the vane motor unit cover Removing the horizontal vane motor 1 Remove the nozzle assembly Refer to 4 2 Remove the screws of the vane motor unit cover and pull out the vane m
55. luded among them c will be displayed 9 9 i save fj OPERATION 1 How to set i save operation 1 Press OPERATE STOP ON OFF button 2 Select COOL HEAT or ECONO COOL mode 3 Press i save button 4 Set the temperature fan speed and airflow direction for i save operation NOTE i save operation cannot be selected during DRY or AUTO mode operation The setting range of HEAT mode i save operation is 10 and 16 31 C 2 groups of setting can be saved One for COOL ECONO COOL one for HEAT i save operation and the weekly timer operation cannot be used together 2 How to cancel operation Press i save button again i save operation can also be cancelled by pressing OPERATION SELECT button to change the operation mode The same setting is select from the next time by simply pressing i save button OBH589D 9 10 EMERGENCY TEST OPERATION In the case of test run operation or emergency operation use EMERGENCY OPERATION switch on the right side of the indoor unit Emergency operation is available when the remote controller is missing or has failed or the batteries in the remote controller are running down The unit will start and OPERATION INDICATOR lamp will light up The first 30 minutes of operation is the test run operation This opera tion is for servicing The indoor fan runs at High speed and the tem perature control does not work After 30 minutes of test run operation the system shifts
56. n unit breakdown or accidents caused by failure to follow the instructions lt Preparation before the repair service gt e Prepare the proper tools Prepare the proper protectors Provide adequate ventilation After stopping the operation of the air conditioner turn off the power supply breaker and remove the power plug Discharge the capacitor before the work involving the electric parts lt Precautions during the repair service gt e Do not perform the work involving the electric parts with wet hands Do not pour water into the electric parts Do not touch the refrigerant Do not touch the hot or cold areas in the refrigeration cycle When the repair or the inspection of the circuit needs to be done without turning off the power exercise great caution not to touch the live parts Revision A Airflow in the Silent mode in the cooling operation has been changed TROUBLESHOOTING has been corrected 10 2 10 4 Revision B e MSZ EF18VEW Ei MSZ EF18VEB Et and MSZ EF18VES ET have been added Revision C MSZ EF18 22 25 35 42 50VE2W E1 ER E1 ER1 have been added x a MSZ EF18 22 25 35 42 50VE2B E1 ER1 and MSZ EF18 22 25 35 42 50VE2S Revision D The descriptions of the dimensions for MSZ EF18 22 25 35 42 50VE2W ER1 and MSZ EF 18 22 25 35 42 50VE28 E1
57. nd 2 time flash 3 time flash 4 time flash 5 time flash 6 time flash 7 time flash 14 flash off at 0 5 sec Cause Cause Cause Cause Cause Cause or more ond intervals Indoor unit Indoor unit unit Outdoor unit Outdoor unit Outdoor unit Cause Cause Trouble Trouble of Trouble Outdoor Trouble of Trouble of Outdoor unit Indoor Outdoor of room indoor fan of indoor power thermistor outdoor con Other ab unit temperature motor unit control system outdoor unit trol system normality Miswiring or indoor coil System abnormality trouble of thermistor serial signal OBH589D 10 7 Test point diagram and voltage Refer to 10 6 Check of indoor fan motor Replace the indoor elec tronic control P C board inverter com pressor 27 Refer to Check of outdoor ther mistors Replace the inverter P C board or the outdoor electronic control P C board Check Flow chart of the detailed outdoor unit failure mode recall func tion 10 4 TROUBLESHOOTING CHECK TABLE Before taking measures make sure that the symptom reappears for accurate troubleshooting When the indoor unit has started operation and detected an abnormality of the following condition the first detection after the power ON the indoor fan motor turns OFF and OPERATION INDICATOR lamp flashes OPERATION INDICATOR Lighted
58. ntennas or wiring Check the following before asking for service 1 Devices affected by the electromagnetic noise TV sets radios FM AM broadcast shortwave 2 Channel frequency broadcast station affected by the electromagnetic noise 3 Channel frequency broadcast station unaffected by the electromagnetic noise 4 Layout of indoor outdoor unit of the air conditioner indoor outdoor wiring earth wire antennas wiring from antennas receiver Electric field intensity of the broadcast station affected by the electromagnetic noise Presence or absence of amplifier such as booster Operation condition of air conditioner when the electromagnetic noise enters in 1 Turn OFF the power supply once and then turn ON the power supply In this situation check for the electromagnetic noise 2 Within 3 minutes after turning ON the power supply press OPERATE STOP ON OFF button on the remote controller for power ON and check for the electromagnetic noise 3 After a short time 3 minutes later after turning ON the outdoor unit starts running During operation check for the electromagnetic noise 4 Press OPERATE STOP ON OFF button on the remote controller for power OFF when the outdoor unit stops but the indoor outdoor communication still runs on In this situation check for the electromagnetic noise OBH589D 10 7 TEST POINT DIAGRAM AND VOLTAGE Indoor power P C board Indoor electronic control P C board Receiver board
59. oom temperature is equal to or lower than the set temperature operation starts in HEAT mode 2 Mode change COOL mode changes to HEAT mode when about 15 minutes have passed with the room temperature 1 C below the set temperature HEAT mode changes to COOL mode when about 15 minutes have passed with the room temperature 1 C above the set temperature NOTE 1 If two or more indoor units are operating in multi system there might be a case that the indoor unit which is operating in ici AUTO cannot change over to the other operating mode COOL HEAT and becomes a state of standby Refer to NOTE 2 FOR MULTI SYSTEM AIR CONDITIONER OBH589D 2 FOR MULTI SYSTEM AIR CONDITIONER OUTDOOR UNIT MXZ series Multi system air conditioner can connect two or more indoor units with one outdoor unit When you try to operate two or more indoor units with one outdoor unit simultaneously one for the cooling and the others for heating the operation mode of the indoor unit that operates first is selected Other indoor units cannot operate and operation indicator lamp flashes as shown in the figure below In this case please set all the indoor units to the same operation mode OPERATION INDICATOR 19 Lighted Or Blinking O Not lighted When indoor unit starts the operation while the defrosting of outdoor unit is being done it takes a few minutes max 10 minutes to blow out the warm air In the heating operation tho
60. or unit does not receive the signal from re mote controller Indoor unit oper ates Outdoor unit does not operate OPERATION INDICATOR lamp on the indoor unit is flashing ON and OFF Outdoor unit Outdoor unit Unit does not Indoor unit Indoor unit does Test Run operation means the operates only does not operate nor operates when not operate when operation within 30 minutes af in Test Run operate even mal operation EMERGENCY EMERGENCY ter EMERGENCY OPERATION operation X in Test Run in COOL or OPERATION OPERATION switch is pressed operation HEAT mode switch is pressed switch is pressed If blinking of OPERATION INDI CATOR lamp cannot be checked it can be checked with failure mode recall function 1 Check indoor out door connecting wire Check if the power is supplied to the indoor unit Refer to 10 6 Check of indoor P C board and indoor fan motor Refer to Check of R V coil Check room temperature thermistor Refer to 10 6 Check of remote controller and indoor electronic control P C board Refer to How to check inverter com pressor Refer to 10 7 Test point diagram and voltage Left lamp Left lamp Left lamp Left lamp Left lamp Left lamp Left lamp Left lamp Flash on a
61. otor unit 3 Remove the screws of the vane motor unit 4 Disconnect the connector from the vane motor Screws of 5 Remove the vane motor from the vane motor unit the vane motor unit OBH589D i OPERATING PROCEDURE PHOTOS 6 Removing the indoor fan motor the indoor coil thermistor and the line flow fan 1 Remove the panel Refer to 1 and the corner box right 2 Remove the indoor electronic control P C board holder the electrical box and the nozzle assembly 3 Remove the screws fixing the motor bed 4 Release the hooks of the water cut and remove the water cut 5 Loosen the screw fixing the line flow fan 6 Remove the motor bed together with the indoor fan motor and the motor band 7 Release the hooks of the motor band and remove the motor band Pull out the indoor fan motor 8 Remove the indoor coil thermistor from the heat exchanger Install the indoor coil thermistor in its former position when assembling it Photo 5 9 Remove the screws fixing the left side and the upper right side of the heat exchanger Photo 7 Photo 8 10 Lift the heat exchanger and pull out the line flow fan to the lower left Screw of the upper right side of the heat exchanger Photo 8 OBH589D 41 Photo 5 Lead wire of the indoor coil thermistor Water cut Screws of the motor bed Photo 6 Screw of the line flow fan Photo 7 Screws of the left side of the heat exchanger
62. tion switch E O SW SW1 OBH589D OBH589D MSZ EF18VE2W MSZ EF22VE2W MSZ EF25VE2W MSZ EF35VE2W MSZ EF18VE2B MSZ EF22VE2B MSZ EF25VE2B MSZ EF35VE2B MSZ EF18VE2S MSZ EF22VE2S MSZ EF25VE2S MSZ EF35VE2S Indoor power P C board Fuse F11 Varistor NR11 Connector to terminal block CN201 Connector to indoor electronic control P C board CN202 Room temperature th Indoor electronic control P C board Connector to power P C board CN102 MSZ EF42VE2W MSZ EF50VE2W MSZ EF42VE2B MSZ EF50VE2B MSZ EF42VE2S MSZ EF50VE2S Indoor fan motor CN211 325 VDC GND high voltage DC 0 15 VDC 3 6 VDC 0 15 VDC Reactor L111 ermistor RT11 Indoor coil thermistor RT12 RT13
63. ture thermistor RT11 Flared connection Refrigerant pipe 96 35 with heat insulator Refrigerant flow in cooling gt Refrigerant flow in heating 8 SERVICE FUNCTIONS MSZ EF18VEW MSZ EF22VEW MSZ EF25VEW MSZ EF35VEW MSZ EF42VEW MSZ EF50VEW MSZ EF18VEB MSZ EF22VEB MSZ EF25VEB MSZ EF35VEB MSZ EF42VEB MSZ EF50VEB MSZ EF18VES MSZ EF22VES MSZ EF25VES MSZ EF35VES MSZ EF42VES MSZ EF50VES MSZ EF18VE2W MSZ EF22VE2W MSZ EF25VE2W MSZ EF35VE2W MSZ EF42VE2W MSZ EF50VE2W MSZ EF18VE2B MSZ EF22VE2B MSZ EF25VE2B MSZ EF35VE2B MSZ EF42VE2B MSZ EF50VE2B MSZ EF18VE2S MSZ EF22VE2S MSZ EF25VE2S MSZ EF35VE2S MSZ EF42VE2S MSZ EF50VE2S 8 1 TIMER SHORT MODE For service the following set time can be shortened by bridging JPG and JPS on the electronic control P C board Refer to 10 7 The set time for the ON OFF timer can be reduced to 1 second for each minute After the breaker is turned on the time for starting the compressor which normally takes 3 minutes can be reduced to 1 minute Restarting the compressor which takes 3 minutes cannot be reduced 8 2 P C BOARD MODIFICATION FOR INDIVIDUAL OPERATION MSZ EF VEW B S A maximum of 4 indoor units with wireless remote controllers can be used in a room In this case to operate each indoor unit individually by each remote controller P C boards of remote controller must be modified according to the number of the indoor unit How to modify the remote controller P C board
64. ugh indoor unit that does not operate may get warm or the sound of refrigerant flow ing may be heard they are not malfunction The reason is that the refrigerant continuously flows into it 9 6 AUTO VANE OPERATION 1 Horizontal vane 1 Vane motor drive These models are equipped with a stepping motor for the horizontal vane The rotating direction speed and angle of the motor are controlled by pulse signals approximately 12 V transmitted from indoor microprocessor 2 The horizontal vane angle and mode change as follows by pressing VANE CONTROL button AUTO Q 179 5 241 3 1 4 1 5 SWING 3 Positioning To confirm the standard position the vane moves until it touches the vane stopper Then the vane is set to the selected angle Confirming of standard position is performed in the following cases a When the operation starts or finishes including timer operation b When the test run starts c When standby mode only during multi system operation starts or finishes 4 VANE AUTO mode In VANE AUTO mode the microprocessor automatically determines the vane angle to make the optimum room tem perature distribution In COOL and DRY operation In HEAT operation Vane angle is fixed to Horizontal position Vane angle is fixed to Angle 4 Horizontal _ _ position 4 5 STOP operation OFF and ON TIMER standby In the following cases the horizontal vane returns to the closed position a

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