SERVICE MANUAL MSZ-A18YV - MSZ-A24YV - MSZ-A26YV
Contents
1. MSZ A24YV E MODELS WIRING DIAGRAM MSZ A26YV E INDOOR UNIT 41 RS TO OUTDOOR z UNIT RT12 CONNECTING _ TB L1 e 3 RED 11254 BLK wel C i PUR LEN we BLU BRN MF WHT L 3 POWER SUPPLY CN211 CORD f 02 RT11 230V ELECTRONIC CONTROL P C BOARD em 50Hz E253 2 15 3 43 1 1 natis z DISPLAY RECEIVER CIRCUIT zd P C BOARD lt BREAKER EZ REMOTE CONTROLLER SYMBOL SYMBOL NAME SYMBOL NAME C11 INDOOR FAN CAPACITOR MV2 VANE MOTOR VERTICAL SR141 SOLID STATE RELAY F11 FUSE 3 15A NR11 VARISTOR TB TERMINAL BLOCK HIC1 DC DC CONVERTER RT11 TEMPERATURE THERMISTOR MF INDOOR FAN MOTOR INNER PROTECTOR RT12 INDOOR COIL THERMISTOR MAIN MV1 VANE MOTOR HORIZONTAL RT13 INDOOR COIL THERMISTOR SUB NOTES 1 About the outdoor side electric wiring refer to the outdoor unit electric wiring diagram for servicing 2 Use copper conductors only For field wiring 3 Symbols below indicate Terminal block Connector OB345A 7 6 REFRIGERANT SYSTEM DIAGRAM MSZ A18YV E MSZ A24YV E Unit mm INDOOR UNIT INDOOR UNIT Refrigerant pipe2. sa D Electrical pT Specifications and rating conditions of main electric parts INDOOR UNIT ltem MSZ A18YV MSZ A24YV E MSZ A26YV Indoor fan capacitor C11 Fuse F11 Vane motor MV1 MV2 Varistor NR11 Solid state relay SR141 Terminal block TB Indoor fan motor thermal fuse 3 NOISE CRITERIA CURVES 2 5uF 440V 250V 3 15A MP20 MP20 TNR10V511K410 S201DH1N 3P MSZ A18YV E MSZ A24YM E MSZ A26YV E FAN SPEED SPL dB A LINE FAN SPEED SPL dB A LINE High 43 e e High 48 oe Test conditions Test conditions Cooling Dry bulb temperature 27C Wet bulb temperature 19 C Cooling Dry bulb temperature 27C Wet bulb temperature 19 C Heating Dry bulb temperature 20 C Wet bulb temperature 15 5 C Sg Heating Dry bulb temperature 20C Wet bulb temperature 15 5 C 80 80 S NS 4 3 E 5 S e 3 8 70 S E NC 70 1 m I a
3. button 3 FAN SPEED CONTROL button Horizontal vane button y IX OFF TIMER button 2 VANE START _ eov Ue Ot ON TIMER button MODE WIDEVANE HR OPERATION SELECT button Jie bution ECONOCOOL LONG MIN MIN button ECONO COOL button fe TIME SET button CLOCK SET button WIDE VANE button LONG button RESET button OB345A 3 2 SPECIFICATION Refer to the service manual OB346 when MSZ A18YV E1 MSZ A24YV_ 1 or MSZ A26YV E1 is connected with MUZ A18YV Et MUZ A24YV E1 or MUZ A26YV Et Refer to the service manual OB319 when MSZ A18YV E1 MSZ A24YV_ 1 or MSZ A26YV E1 is connected with MXZ A26WV Et or MXZ A32WV as multi system units Indoor model MSZ A18YV_ E1 MSZ A24YV 1 Function Cooling Heating Cooling Heating Single phase Single phase Powersupply 230V 50Hz 230V 50Hz Air flow High Med Low 852 690 498 1 032 768 522 1 032 786 522 Power outlet 10 10 Running current 1 0 30 0 34 Power input x1 60 69 Auxiliary heater Power factor 1 87 87 Fan motor current 1 0 30 0 34 Model RC4V32 AA RC4V40 AA Winding WHT BLK 293 WHT BLK 138 2 resistance at 20 C BLK RED 146 BLK RED 159 0 Dimensions WxHxD 1 100x325x258 1 100x325x258 Weight 16 16 Air direction 5 5 So
4. gn 60 1 t i E 1 NC 60 T F T gt ad i zT Eee c gt J DM ATE Ei EMI i w 50 T j i i 5 NNNON 5 KANE XG A T q F T E i F i T i ET ee ae odo eee E i 40 lt a NC 40 a Es x 5 a 2 i i 30 T o 30 i o I INGC 30 S lt k lt I m 20 APPROXIMATE 1 i P 2 approximate 1 i gt THRESHOLD OF ENE F a d 7 NE 40 20 5 CONTINUOUS 4 TG 8 t Pd 1 i NOISE i i F 10 i 1 10 f 63 125 250 500 1000 2000 4000 8000 63 125 250 500 1000 2000 4000 8000 BAND CENTER FREQUENCIES Hz BAND CENTER FREQUENCIES Hz INDOORUNIT WALL 2 1 A 0 8m A MICROPHONE OB345A 5 4 OUTLINES AND DIMENSIONS MSZ A18YV E Unit mm MSZ A24YV E MSZ A26YV E INDOOR UNIT Installation plate Indoor unit 1068 N Wall hole 75 k gt Installation plate cM e Am Insulation 50 O D 321 0 for MSZ A18 A24YV T Liquid line 9 52 0 5m N Gas line 12 0 43m Insulation 50 321 0 Ls for MSZ A26YV 2 Drain hose 16 Air out Connected part O D 58 19 Insulation 28 i Power supply cord Lead to right 2 0m 2 P Lead to left 1 0m Wireless remote controller
5. o 4 D LO S Joints 2 e DI e Receiver board CN301 19 t lt Emergency operation switch Timer short mode point JPS JPG Refer to 7 1 Indoor coil thermistor RT12 main RT13 sub Room temperature thermistor RT11 Resistance kQ L INI D p X Eb INI ID LI 1L 1 Ld E 0 10 20 30 40 50 60 Temperature C DISASSEMBLY INSTRUCTIONS lt Terminal with lock mechanism Detaching points gt In case of terminal with lock mechanism detach the terminal as shown below There are two types Refer to 1 and 2 of the terminal with lock mechanism 9 1 MSZ A18YV E7 The terminal with no lock mechanism can be removed by pulling it out Check the shape of the terminal and work 1 Slide the sleeve and check if there is a locking lever or not Slide the sleeve 1 8 Pull the terminal while pushing the locking lever m MSZ A24YV m gt MSZ A26YV 2 The terminal with this connector is a terminal with lock mechanism Hold the sleeve and pull out the terminal slowly Connector m 1 NOTE Turn OFF power supply before disassembly 1 Removing the front panel 1 Remove the screw caps of the f
6. OB345A 6 5 WIRING DIAGRAM MSZ A18YV E MODEL WIRING DIAGRAM INDOOR UNIT i Ia RT13 TO OUTDOOR BEI EI ORY CON H1 RT12 1 H ewe PE Us RED CN201 136 CN112 BLK 3 38 1 ZNR11 3 GRY 12V N 2 OTT TL YLW BLU ER imis un BRN L BRN TAB12 11 SR141H 3 RED POWER O f 4 SUPPLY s GNATI CORD Pa N 230V e 02 101 ELECTRONIC CONTROL P C BOARD f11 ews 11 50 2__ m crores BLU 3 3 1 41 BREAKER CONTROLLER NAME SYMBOL NAME SYMBOL NAME INDOOR FAN CAPACITOR MV1 VANE MOTOR HORIZONTAL RT12 INDOOR COIL THERMISTOR MAIN FUSE 3 15A MV2 VANE MOTOR VERTICAL RT13 INDOOR COIL THERMISTOR SUB DC DC CONVERTER NR11 VARISTOR SR141 SOLID STATE RELAY INDOOR FAN MOTOR INNER FUSE RT11 ROOM TEMPERATURE THERMISTOR TB TERMINAL BLOCK NOTES 1 About the outdoor side electric wiring refer to the outdoor unit electric wiring diagram for servicing 2 Use copper conductors only For field wiring 3 Symbols below indicate 1 1 eee 2 ava wv DISPLAY RECEIVER CIRCUIT P C BOARD P C BOARD gt oc 45 Terminal block Connector
7. Room temperature thermistor RT11 1I To disable Auto restart function solder jumper wire to JRO7 Refer to 7 3 Resistance kQ S 0 10 20 30 40 50 60 Temperature C OB345A 18 pT TEST POINT DIAGRAM AND VOLTAGE MSZ A26YV MSZ A18YV E MSZ A24YV Et Indoor electronic control P C board TYPE 2 OM o t Fuse F11 250 VAC 3 15A R132 SE 12vpc 0 22 C 12 gt gt To disable Auto restart function solder jumper wire to JRO7 Refer to 7 3 OB345A Rint ons JRO7 JP23 o CHA m 1 o JP310 91820 AW 2 Ric20 4 RIAZ0 OHO c2 Pi JP10 o o P37 J o og 3 JP17 o a GND 14A 00000000 000000 s 9 z eg Fan motor power supply CN211 Power supply input 230 VAC 5voc thermistor 11 Indoor coil thermistor RT12 main Indoor coil thermistor RT13 sub CN121 CN Vane motor power supply CN151 JPG Short
8. j jurc c 2 5 second OFF Outdoor unit does not operate When it cannot properly read data in the nonvolatile memory of the indoor electronic control P C board Check the indoor electronic control P C board Outdoor power System 5 time flash ososososooooosgoso qi ey DE TA ee 2 5 second OFF Outdoor unit does not operate When compressor has stopped due to over current protection or start up failure protection 3 times in a row within 5 seconds after start up Refer to Check of inverter compressor Refer to service manual OB346 or OB319 Outdoor thermistors 6 time flash 7 S 606 0808080 idi 2 5 second OFF Outdoor unit does not operate lt Thermistor short gt Thermistors are abnormal when they short after compressor start up lt Thermistor open gt Thermistors are abnormal when they open after compressor start up However discharge temperature thermistor is abnormal when open circuit is detected more than 10 minutes after compressor start up Shortage of refrigerant Replace the outdoor control P C board Refer to Check of outdoor thermistor Refer to service manual OB346 or OB319 Outdoor control System 7 time flash own 60808080 Y WP er Ran 2 5 second OFF 0808000008 a ae Sr Outdoor unit does not operate When it cannot properly read data in the nonvolatile memory of
9. 12 7 Refrigerant pipe 415 88 with heat insulator with heat insulator Indoor coil Indoor coil Indoor thermistor Indoor thermistor heat RT12 main ea RT12 main exchanger Distributor exchanger Distributor Flared connection Flared connection 1 Indoor coil Indoor coil thermistor thermistor RT13 sub RT13 sub Room temperature Room temperature thermistor thermistor RT11 RT11 Flared connection ll Flared connection Refrigerant piped6 35 Refrigerant pipe 6 35 with heat insulator with heat insulator MSZ A26YV E INDOOR UNIT Refrigerant pipe 15 88 with heat insulator Flared connection Indoor coil thermistor RT12 main Indoor coil thermistor RT13 sub Room temperature thermistor RT11 Strainer 50 Flared connection 4 Refrigerant pipe 9 52 with heat insulator Refrigerant flow in cooling Refrigerant flow in heating OB345A 8 7 SERVICE FUNCTIONS MSZ A18YV MSZ A24YV MSZ A26YV 7 1 TIMER SHORT MODE For service set time can be shortened by short circuit of JPG and JPS on the electronic control P C board The time will be shortened as follows Set time 1 minute 1 second Set time 3 minute 3 second It takes 3 minutes for the compressor to start operation However the starting time is shortened by short circuit of JPG and JPS 7 2 P C
10. does not operate D How to check mis wiring and serial signal error when outdoor unit does not work Start Press once EMERGENCY OPERATION switch Y Turn ON the power supply Indoor outdoor unit Y After 3 minutes mis wiring is indicated 0 5 second ON 0 5 second OFF on OPERATION INDICATOR lamp on the indoor unit Yes Correct them Is there any mis wi or wire disconnectio ring poor contact n 2 No A oc Turn OFF the power supply Indoor outdoor unit Disconnect the indoor outdoor connecting wire Short circuit indoor terminal block and 3 Turn ON the power supply Indoor outdoor unit During pressing the OPERATION SELECT button on the remote controller press the RESET button At first release the RESET button And release the OPERATION SELECT button since all LCD in operation display section of the remote controller is displayed after 3 seconds Transmit the signal of remote controller pressing OPERATE STOP ON OFF button on the remote controller The above procedure allows OPERATION INDICATOR lamp to indicate the failure mode Does the right side of OPERATION INDICATOR The following indication applies regardless of shape of the indicator Blinking Short circuit of JPG and JPS on the indoor electronic control P C board enables self check to be displayed in 3 sec
11. front lid then use the remote controller Insert the negative pole 9 of the batteries first Check if the polarity of the battereis is correct RESET button NOTE 1 If the RESET button is not pressed the remote controller may not operate correctly 2 Do not use the leaking batteries INFORMATION FOR MULTI SYSTEM AIR CONDITIONER OUTDOOR UNIT MXZ series Multi system air conditioner can connect two or more indoor units with one outdoor unit Unit won t operate in case the total capacity of indoor units exceeds the capacity of outdoor units Do not connect indoor units beyond the outdoor unit capacity When you try to operate two or more indoor units with one outdoor unit simultaneously one for the cooling and the other for heating the operation mode of the indoor unit that operates earlier is selected The other indoor units will start the operation later cannot operate indicating as shown in the figure below In this case please set all the indoor units to the same operation mode Operation Indicator J Lighted sc M N 1 EE Blinking When indoor units 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 though indoor unit that does not operate may get warm or the sound of refrigerant flowing may be heard they are not malfunction The rea
12. md md e gt C4V40 OC RUBBER MOUNT gt N gt gt gt gt 11 OPTIONAL PARTS AIR CLEANING FILTER AIR CLEANING FILTER removes fine dust of 0 01 micron from air by means of static electricity Normal life of AIR CLEANING FILTER is 4 months However when it becomes dirty replace it as soon as possible Clogged AIR CLEANING FILTER may reduce the air conditioner capacity or cause frost on the air outlet DO NOT reuse AIR CLEANING FILTER even if it is washed DO NOT remove or attach AIR CLEANING FILTER during unit operation Model Part No MSZ A18YV MSZ A24YV MAC 1700FT MSZ A26YV Air cleanig filter White bellows type MITSUBISHI ELECTRIC CORPORATION HEAD OFFICE MITSUBISHI BLDG 2 7 3 MARUNOUCHI CHIYODA KU TOKYO100 8310 JAPAN Copyright 2004 MITSUBISHI ELECTRIC CORPORATION Distributed in Mar 2012 No OB345 REVISED EDITION A Distributed in Apr 2004 No OB345 6 New publication effective Mar 2012 Made in Japan Specifications are subject to change without notice
13. outdoor electronic control P C board Replace the outdoor electronic control P C board Refer to service manual OB346 or OB319 MXZ type Operation mode setting Right lamp flashes Y 600000800000 2 5 second OFF b ighted J Blinking Outdoor unit operates but indoor unit does not operate When the operation mode of each indoor unit is differently set to COOL includes DRY and HEAT at same time the operation mode of indoor unit that has operated at first has the priority Unify the operation mode Refer to service manual OB319 NOTE When the indoor unit has started operation and the above detection method has detected an abnormality the first detection after the power ON the indoor electronic control P C board turns OFF the indoor fan motor with the OPERATION INDICATOR lamp flashing OB345A 13 PR 2 Trouble criterion of main parts MSZ A18YV E MSZ A24YV E MSZ A26YV E Part name Check method and criterion Figure Room temperature Measure the resistance with a tester thermistor RT11 Part temperature 10 C 30 C Indoor coil thermistor Normal Abnormal RT12 main RT13 sub 8 KQ 20 Open or short circuit Measure the resistance between the terminals with a tester MSZ A18YV Part temperature 10 C 30 C MAIN 5 Color of Normal Abnormal ndeor Tfa
14. unit Press the RESET button on the remote controller A Turn OFF inverter controlled lighting equipment Turn OFF the power supply and then turn ON again Indoor outdoor unit Press the EMERGENCY OPERATION switch Reinstall After 3 minutes either the is mis wiring unit or the indicated on light each OPERATION other away Attach a filter on receiving section of the indoor unit INDICATOR lamp on the indoor unit TEST POINT DIAGRAM AND VOLTAGE MSZ A18YV Em MSZ A24YV Em MSZ A26YV E Indoor electronic control P C board TYPE 1 There are 2 types of electronic control P C boards TYPE1 TYPE2 They are both compatible with MSZ A18 24 26YV Fan motor power supply CN211 Power supply input 230 VAC EDD nd TERIS 5voc d e u oa Fuse F11 b Ote Em 250 VAC 3 15A ME s eae Rt a A Room temperature ther a 57 M es mistor RT 11 R132 mes we et o em Indoor coil thermistor RT12 main CN121 Indoor coil su gm thermistor RT13 sub DEOON243B SE76A794601 Vane motor power supply CN151 aresstesecssscssssscossssossscooo 5 Emergency operation switch Timer short mode point JPS JPG Refer to 7 1 Indoor coil thermistor RT12 main RT13 sub
15. BOARD MODIFICATION FOR INDIVIDUAL OPERATION 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 Remove batteries before modification The board has a print as shown below m 1 m 1 m 1 Remote controller model KPOA J2 NOTE For modification take out the bat teries and press the OPERATE STOP ON OFF but ton 2 or 3 times at first After finish modification put back the batteries then press the RESET button 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 How to set the remote controller exclusively for particular indoor unit Solder both J1 and J2 After you turn the breaker ON the first remote controller that sends the signal to the indoor unit will be regarded as the remote contro
16. Changes for the Better MITSUBISHI a ELECTRIC Parts numbers of indoor fan motor and motor band have been changed Another type of the electronic control P C board TYPE 2 SPLIT TYPE AIR CONDITIONERS been added 6 the original onie TYPE 1 They are both compatible with MSZ A18 24 26Y V Some descriptions have been modified Please void OB345 m INDOOR UNIT No OB345 REVISED EDITION A SERVICE MANUAL Models MSZ A18YV MSZ A24YV MSZ A26YV CONTENTS 1 PART NAMES AND 2 2 SPECIFICATION 4 3 NOISE CRITERIA CURVES snassusushsasauossauaunRsuuuam 5 4 OUTLINES AND DIMENSIONS 6 5 WIRING DIAGRAM WESREERREERSREEESRRESERRRSESSESERRSANRERSEERANENE 7 6 REFRIGERANT SYSTEM DIAGRAM 8 m SERVICE FUNCTIONS 9 8 TROUBLESHOOTING 11 ME 9 DISASSEMBLY INSTRUCTIONS 20 MSZ A24YV 10 PARTS LIST WEERREANRREEEESNRRRRSESSRERASRSREENSEANSRRENSERERERNANAEN 22 MSZ A26YV 11 OPTIONAL PARTS BACK COVER NOTE This service m
17. TS REMOTE CONTROLLER 1 20 25 2 SLEEVE SY BEARING z 4 2 lt 11 KZ ROOM TEMPERATURE THERMISTOR RN FUSE 8 9 VARISTOR 16 17 18 10 3 INDOOR UNIT FUNCTIONAL PARTS AND ELECTRICAL PARTS Part numbers that are circled are not shown in the illustration Symbol Q ty unit i iri MSZ A18 MSZ A24 MSZ A26 Part Name in Wiring Y lu YV Remarks Diagram WH WH o LINE FLOW FAN BEARING MOUNT SLEEVE BEARING DRAIN HOSE NOZZLE ASSEMBLY WH VANE UPPER WH VANE LOWER WH FUSE VARISTOR VANE CRANK SET INDOOR FAN MOTOR ASSEMBLY C4V40 O0 INDOOR FAN MOTOR ASSEMBLY Including RUBBER MOUNT VANE MOTOR VERTICAL 2 2 RIGHT amp LEFT VANE MOTOR HORIZONTAL UP amp DOWN MOTOR BAND SET Including two kinds of MOTOR BAND DISPLAY P C BOARD RECEIVER P C BOARD ELECTRONIC CONTROL P C BOARD 1 AUTORESTART ELECTRONIC CONTROL P C BOARD 1 including NO ELECTRONIC CONTROL P C BOARD 1 including No 7 ROOM TEMPERATURE THERMISTOR RT11 TERMINAL BLOCK TB INDOOR COIL THERMISTOR RT12 RT13 INDOOR COIL THERMISTOR RT12 RT13 VANE MOTOR SUPPORT SET RIGHT VANE MOTOR SUPPORT SET LEFT 1 Refer to page 18 and 19 10 4 ACCESSORY AND REMOTE CONTROLLER 24 E02 529 426 REMOTE CONTROLLER 1 1 1 25 E02 527 083 REMOTE CONTROLLER HOLDER 1 1 1 OB345A 23 3 15A COIN d d md md md d
18. anual describes technical data of the indoor unit Refer to the service manual OB346 when MSZ A18YV E1 MSZ A24YV E1 or MSZ A26YV is connected with MUZ A18YV E1 MUZ A24YV _ E1 or MUZ A26YV 1 Refer to the service manual OB319 when MSZ A18YV E1 MSZ A24YV E1 or MSZ A26YV is connected with MXZ A26WV 1 or MXZ A32WV E1 as multi system units gt ea 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 malfunction unit breakdown or accidents caused by failure to follow the instructions Revision A Parts numbers of indoor fan motor and motor band have been changed Another type of the electronic control P C board 2 has been added to the original TYPE 1 They are both compatible with MSZ A18 24 26YV LE Some descriptions have been modified 1 PART NAMES AND FUNCTIONS INDOOR UNIT MSZ A18YV E MSZ A24YV E MSZ A26YV E g cleaning filter option m White bellows t
19. door unit Indoor unit Outdoor unit Outdoor unit Outdoor unit interval Trouble of Cause room temp Trouble of Trouble of Outdoor Trouble of Trouble of Indoor indoor fan indoor unit power thermistor outdoor Outdoor unit door coil motor control system in outdoor control ue thermistor system abnormality unit system serial signal Refer to Check room Refer to Replace the Refer to Refer to Replace the How to temperature Check of indoor Check of Check of outdoor check mis thermistor indoor fan electronic inverter outdoor electronic wiring and and indoor motor on control compressor thermistors control P C serial signal coil thermis page 15 P C board board error When tor outdoor unit Refer to does not Test point work on diagram and page 17 voltage on page 18 and 19 I I TI I 1 As for outdoor unit MUZ type refer to service manual OB346 As for outdoor unit MXZ type refer to service manual OB319 OB345A 12 1 Troubleshooting check table The following indication applies regardless of shape of the indicator A 2 Operation Indicator W Lighted Not lighted Before taking measures make sure that the symptom reappears for accurate troubleshooting Self check table Abnormal po
20. he memory However it takes at least 3 minutes for the compressor to start running 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 cancelled elf 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 appliances 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 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 OB345A 10 8 TROUBLESHOOTING MSZ A24YV MSZ A18YV MSZ A26YV 8 1 Cautions on troubleshooting 1 Before troubleshooting check the following 1 Check the power supply voltage 2 Check the indoor outdoor connecting wire for mis wiring 2 Take care the following during servicing 1 Before servicing the air conditioner be sure to first turn off the remote controller to stop the main unit and then after confir
21. int Operation indicator lamp Symptom Detection method Flashing of the OPERATION INDICATOR lamp the left hand side lamp indicates possible abnormalities The OPERATION INDICATOR lamp the left hand side lamp is lighting during normal operation Checkpoint Mis Wiring or Serial signal 0 5 second ON sosososo 0 5 second OFF Outdoor unit does not operate 3 minutes after power supply turns ON when serial signal is not received Refer to How to check mis wiring and serial signal error on page 17 Indoor coil thermistor Room temperature thermistor 2 time flash eoe Y 2 5 OFF Outdoor unit does not operate Detect Indoor coil room temperature thermistor short or open circuit every 8 seconds during operation Refer to the characteristics of main indoor coil thermistor sub indoor coil thermistor and room temperature thermistor on page 18 and 19 Indoor fan motor 3 time flash Y Y 0 0800 00080808000 Side f 2 5 second OFF Indoor fan repeats 12 seconds ON and 3minutes OFF When the indoor fan breaks the fan keeps stopping When rotational frequency feedback signal is not emit during 12 second indoor fan operation Refer to Check of indoor fan motor on page 15 Indoor control system 4 time flash Y 7 eosososooooososoeso ESAE cn Y hd
22. left side of the heat exchanger 9 Lift the left side of the heat exchanger 10 Remove the line flow fan Photo 8 Hole cover Photo 6 Screws fixing the left side of the heat exchanger Photo 7 Indoor coil thermistor Water cut Screws fixing the fan motor OB345A 21 10 PARTS LIST non RoHS compliant MSZ A18YV En WH MSZ A24YV En WH MSZ A26YV En WH 10 1 INDOOR UNIT STRUCTURAL PARTS 10 2 INDOOR UNIT HEAT EXCHANGER N SS PE 5 24 10 1 INDOOR UNIT STRUCTURAL PARTS Part number that is circled is not shown in the illustration Symbol Q ty unit in Wirin MSZ A24 Part Name g YV YV Remarks Diagram WH INSTALLATION PLATE BOX WH FRONT PANEL ASSEMBLY WH CATCH SCREW CAP WH GRILLE WH CATECHIN AIR FILTER CORNER BOX RIGHT LAMP PANEL Including No 4 5 6 4PCS SET 3PCS SET aja Nle o Alea ea 1 N elv INDOOR HEAT EXCHANGER INDOOR HEAT EXCHANGER UNION GAS UNION GAS UNION LIQUID UNION LIQUID OB345A 22 PARTS LIST non RoHS compliant MSZ A18YV E1 WH MSZ A24YV E1 WH MSZ A26YV En WH 10 3 INDOOR UNIT FUNCTIONAL PARTS AND 10 4 ACCESSORY AND ELECTRICAL PAR
23. ll the unit away from lights Attach a filter on receiving part Yes Replace the indoor electronic control P C board No 5V or 0 VDC OB345A 15 The unit does not operate with the remote controller Also the OPERATION INDICATOR lamp does not light up by pressing the EMERGENCY OPERATION switch Check of indoor electronic control P C board Check the both parts side and pattern side of indoor electronic control Varistor NR11 board visually C Turn OFF the power supply Remove indoor fan motor connector CN211 and vane motor connector CN151 from the indoor electronic control P C board and turn ON the power supply Fuse F11 Does the unit operate with the remote controller Does the OPERATION INDICATOR lamp light up by pressing the EMERGENCY OPERATION switch Indoor electronic control P C board Turn OFF the power supply Replace the vane motor Turn OFF the power supply Is winding resistance of vane motor 0 Q Replace the fuse Yes Is winding resistance of fan motor 0 Q Is fuse F11 blown Iss varistor NR11 burnt oN No Replace the indoor electronic control P C board Replace the fan motor Replace the varistor OB345A 16 When OPERATION INDICATOR lamp flashes ON and OFF in every 0 5 second Outdoor unit
24. ller 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 has turned off or the power supply has shut down Please conduct the above setting once again after the power has restored 7 3 AUTO RESTART FUNCTION When the indoor unit is controlled with the remote controller the operation mode 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 However if the unit is operated FEEL CONTROL mode before power failure the operation is not memorized In FEEL CONTROL mode the operation is decided by the initial room tempera ture OB345A How to disable AUTO RESTART FUNCTION Turn off the main power for the unit Pull out the electronic control P C board the receiver P C board and the display P C board Refer to page 20 Solder jumper wire to the RESISTOR JRO7 on the indoor electronic control P C board Refer to page 18 and 19 E CN111 BE o io z o 2 o wo z o D swi CN101 CN102 CN101 CN102 Operation Olf the main power has been cut the operation settings remain GAfter the power is restored the unit restarts automatically according to t
25. ming 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 electronic control P C board 3 When removing the electronic control 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 m 1 1 Incorrect Correct 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 service work 2 Before servicing check that the connector and terminal are connected properly 3 If the electronic control P C board is supposed to be defective check the copper foil pattern for disconnection and the components for bursting and discolouration 4 When troubleshooting refer to the flow chart on page 12 and the check table on page 13 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 the RESET button with a thin instrument and Then reattach the
26. nimotonME lead wire MSZ A18YV_ MSZ A24 A26YV Open or FUSE 5 WHT BLK 282 Q 305 Q 132 Q 144 Q short circuit MSZ A18YV BLK RED 1410 1520 1520 1660 INNER FUSE 2 TAS OUI ORIS MSZ A24 A26YV MSZ A24 A26YV Measure the voltage power ON INNER t Color of lead wire Normal Abnormal SER 2 BRN YUW 4 5 5 5V 3 When f t 86 15 CLOSE 2 nen Veso 19 Remain ov or 5V 0o Approx Horizontal vane motor MV1 Vertical vane motor MV2 OB345A Measure the resistance between the terminal with a tester Part temperature 10 C 30 C Normal Abnormal 282 Q 306 Q Open or short circuit 14 ORN GRN INNER PROTECTOR When OPERATION INDICATOR lamp flashes 3 time Indoor fan motor does not operate Check of indoor fan motor Turn OFF the power supply Check connector CN211 visually Yes No Are lead wires connected gt Is soldered point of the connector P Resolder it Y correctly soldered Yes Reconnect the lead wires Y Disconnect lead wires from connector CN211 on the indoor electronic control P C board Pay enough attention to the Measure resistance between lead wires No 3 and No 4 and then No 1 and No 4 high voltage on the fan motor connector Y Turn ON the power supply Stop it if the unit operate P m Insert screwdriver in
27. oard 5 Remove the screws of earth wire 6 Remove the fan motor lead wire and indoor coil thermistor from the electrical box 7 Remove the lead wire of vane motor from the bottom of electrical box 8 Remove the screw fixing the electrical box and remove the electrical box Photo 3 Screws of the earth wire Screw of the electrical cover Screw of the electrical box 4 Removing the vane motor 1 Remove the front panel Refer to 1 2 Remove the electrical cover Refer to 2 3 Remove the lead wire of vane motor Refer to 3 4 Remove the R L holder 5 Pull out the drain hose from the nozzle assembly and remove the nozzle assembly 6 Remove the screws of the vane motor and disconnect the connector 7 Remove the vane motor Photo 5 Screws of the SN vane motor pm AN L9 Vane motor Photo 4 Vane motors Screws of the vane motor 5 Removing the line flow fan and the indoor fan motor 1 Remove the front panel Refer to 1 2 Remove the electrical box Refer to 3 3 Pull out the drain hose from the nozzle assembly and remove the nozzle assembly 4 Remove the water cut 5 Slide the hole cover and remove the hole cover 6 Remove the hexagon socket set screw from the line flow fan 7 Remove the screws fixing the fan motor and remove the fan motor Be careful not to drop the fan motor because it is heavy 8 Remove the screws fixing the
28. onds 2 Mis wiring may damage indoor electronic control P C board during the operation Be sure to confirm the wiring is correct before the operation starts No Replace the indoor Operation Indicator vty lamp blink quickly TTA Yes Release the failure mode 3 Remove the short circuit between indoor terminal block and 3 Reconnect the indoor outdoor connecting wire Turn ON the power supply Indoor outdoor unit Press the EMERGENCY OPERATION switch pee SO UE Is there amplitude of 5 to 10V DC between outdoor terminal block and 3 after 3 minutes for confirmation of serial signal Yes Reconnect the power supply cable Is there 230V AC between outdoor terminal block and INI Yes Is there 325V DC between CN801 and Q on the outdoor electronic control P C board Check of power No lt supply Yes Replace the outdoor electronic control P C board As for outdoor unit MXZ type refer to service manual OB319 OB345A 17 electronic control light up or OFF P C board Replace the indoor outdoor connecting wire x3 Be sure to release the failure mode recall function after checking Procedure of release of failure mode Press the EMERGENCY OPERATION switch Turn OFF the power supply Indoor outdoor
29. ront panel Remove the screws 2 Pull the panel down to your side slightly and unhook the catches at the top OPERATING PROCEDURE PHOTOS Photo 1 Front panel Screws 2 Removing the electronic control P C board the receiver P C board and the display P C board 1 Remove the front panel Refer to 1 2 Remove the screw of the electrical cover Remove the electrical cover 3 Remove the screws of the V A clamp Remove the V A clamp 4 Remove the screw of the terminal block 5 Remove the screws of the earth wire 6 Disconnect all the connectors and all the lead wires on the electronic control P C board 7 Remove the R L holder 8 Remove the electronic control P C board 9 Open the R L holder remove the receiver P C board and the display P C board Photo 2 Screws of the earth wire connectors Vane motor KG connector d Indoor electronic control P C board Screw of the electrical cover R L X Screw of Receiver Screw of the holder the terminal P C clamp block board OB345A 20 OPERATING PROCEDURE PHOTOS 3 Removing the electrical box 1 Remove the front panel Refer to 1 2 Remove the electrical cover Refer to 2 3 Disconnect the connector of the indoor coil thermistor 4 Disconnect the motor connector CN211 and CN121 and the vane motor connector CN151 on the electronic control P C b
30. son is that the refrigerant continuously flows into it OB345A 11 SR O 8 2 Instruction of troubleshooting Indoor unit Indoor unit operates Indoor unit operates Outdoor unit does not does not receive OPERATION INDICATOR Outdoor unit operate normally the signal from lamp on the indoor unit is does not rampte contraller flashing on and off operate Outdoor unit Unit does not Indoor unit Outdoor unit does not operate does not operate operates in operate operates when norma when the weston event lithe EMERGENCY only Test Run operation in EMERGENCY Test Run OPERATION PESE switch is pressed OPERATION Operation HEAT mode p switch is pressed Check room 1 Check indoor outdoor temperature Refer to connecting wire thermistor Refer to Check of Check if the power Refer to Check of Check of remote controller to the cor 9 diagram and COMPressor 0 7 board Check of indoor voltage on electronic control page 18 and 19 P C board Flash on and 2 time flash 3 time flash 4 time flash 5 time flash 6 flash 7 time flash off at oe Cause Cause Cause Cause Cause Cause secon Indoor unit In
31. to air outlet to rotate indoor fan Is resistance 0 short circuit or lt lt open circuit 3 No motor slowly for 1 revolution or over and measure others voltage between No 2 and No 3 on CN121 Yes 0 or e No Y Repair or replace the indoor fan motor Does voltage repeat 0 VDC and 5 VDC Y Yes Replace the indoor electronic control P C board Indoor unit operates by pressing the EMERGENCY OPERATION switch but does not operate with the remote con troller Check of remote controller and receiver P C board x Check if the remote controller is exclusive for this air conditioner C Switch on the remote controller No display oni the the remote Replace the batteries Refer to page 11 controller visible not clear Y Yes Remove the batteries then set them back and press the RESET button Check if the unit operates with the remote controller Does the unit operate with the No gt Turn on a radio to AM and press switch on remote controller the remote controller Yes Y No Is noise heard from radio Replace the remote controller Y Yes Are there any fluorescent lights of Yes inverter or rapid start type within the range of 1m Measure the voltage between receiver board connector CN301 No 1 and No 3 when the remote controller button is pressed Y Is the voltage approximately 4 VDC Reinsta
32. und level High Med Low 43 38 31 48 40 32 Fan speed High Med Low 1 120 940 720 1 310 1030 750 1 310 1050 750 Fan speed regulator 3 3 Thermistor RT11 at 25 10 10 Thermistor RT12 at 25 C 10 10 Thermistor RT13 at 25 C 10 10 Remote controller model KPOA KPOA Electrical Indoor model MSZ A26YV Function Cooling Heating Single phase Power supply 230V 50Hz Air flow High MedX Low 1 032 798 564 1 032 816 564 Power outlet 10 Running current 1 0 34 Power input 1 69 Auxiliary heater Power factor 1 88 Fan motor current x1 0 34 Model RC4V40 AA Winding WHT BLK 138 2 resistance at 20 C BLK RED 159 0 Dimensions WxHxD 1 100x325x258 Weight 16 Air direction 5 Sound level High Med Low 48 40 33 Fan speed High Med Low 1 310 1 060 800 1 310 1 080 800 Fan speed regulator Thermistor RT11 at 25 C Thermistor RT12 at 25 C Thermistor RT13 at 25 C Remote controller model NOTE Test conditions are based on ISO 5151 Cooling Indoor Dry bulb temperature 27 C Wet bulb temperature 19 C Outdoor Dry bulb temperature 35 C Wet bulb temperature 24 C Heating Indoor Dry bulb temperature 20 C Wet bulb temperature 15 5 C Outdoor Dry bulb temperature 7 C Wet bulb temperature 6 C Indoor Outdoor piping length 5m Reference value 1 Measured under rated operating frequency OB345A 4
33. ype Power supply cord Remote control receiving section _Catechin air filter Vertical vanes C Horizontal vane Remote controller Display section Operation section When the grille is opened Operation indicator lamp 0 0 YV INV WIDE amp LONG AIR FLOW _ Operation Indicator Remote control receiving section ACCESSORIES MSZ A18YV MSZ A24YV Indoor unit MSZ A26YV Installation plate 1 Installation plate fixing screw 4 x 25 mm Remote controller holder Fixing screw for x 3 5 x 1 6 mm Black Battery AAA for remote controller Wireless remote controller Felt tape Used for left or left rear piping OB345A 2 REMOTE CONTROLLER MSZ A18YV MSZ A24YV MSZ A26YV m 1 m 1 m 1 Signal transmitting section fa MITSUBISHI ELECTRIC Operation display section OPERATE STOP ON OFF button TEMPERATURE buttons Indication of remote controller model is on back Open the front lid Vertical vane button
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