SM FTXN-L+RXN
Contents
1. Conditioners Service Manual ill m il E TT E Ein me c Service Manual SM Inverter i 1 0 Introduction Inverter Air conditioning technology is today s solution for superior comfort higher efficiency and better energy saving This Service Manual will intro Daikin Inverter Residential and Light Commercial product INVERTER Y Series Single Split Residential Light Commercial 1 INDOORS 11 OUTDOORS 1 1 INVERTER SINGLE SPLIT Residential ATXN FTXN LV FTXN LV1B9 amp ARXN RXN LV RXN LV 189 High Quality amp Efficiency DC Inverter compressor High Performance Daikin Inverter Controller 5 Step less Fan operation New Inverter only Remote Control Piping Length amp Elevation Max total Pre charge Model piping Max height for up to Additional length difference piping length charge m m m Terminal Block for outdoor Equipped with 7 segment display to improve serviceability Excluded for ARXN RXN25 30LV1B 9 To retrieve error code amp running parameters Service Manual SM Inverter i 2 Disable Auto Random Restart function Series Series II To disable the auto random restart function kindly cut off the jumper as highlighted in attachment Please be informed that after disable auto random restart unit 12. Command Rotation Limit Rotation Target Rotation Lower limit rotation Starting Rotation AT Defrost Defrost control for heat pump model only STARTING ROTATION STARTING CONTROL To avoid excessive oil discharge from compressor or to promote oil lubrication during startup To prevent liquid flood back to the compressor To limit starting current When compressor starts to rotate from OFF to ON compressor rotation is set to run gradually to each upper limit at a specific timer setting Compressor rotation f Time min ARXN RXN25LV1B 9 ARXN RXN50LV1B 9 ARXN RXN60LV1B 9 Service Manual SM Inverter_ i 10 COMMAND ROTATION Cut in upon termination of Starting Control Achieve capacity control by controlling the compressor rotation based on Temperature difference between set and room temperature AT e Limit Rotation e Defrost control Fuzzy Control Based on temperature difference AT current fan speed setting amp current indoor operating mode at every 30 seconds interval Temperature Difference Condition 1 Condition 2 AT dAT dou dAT AT Use to set target for compressor frequency change Compressor frequency 15 Increased decreased LIMIT ROTATION Determine from e Upper limit rotation A minimum value was determined among the upper limits rotation 1 e protection controls Lower limit rotation A maxim
3. C 99 C 109 C Frequency keep zone 90 C 107 C Reset zone If compressor discharge temperature gt 102 C 111 C for the first time this control starts and set the current frequency as upper limit At the same time running frequency start to reduce by 1 step and so on until temperature falls between 99 C 109 C and 90 C 107 C at the maintain zone This protection is activated when the compressor discharge temperature gt 110 C 120 C The compressor will stop and considered trip compressor discharge temperature lt 90 C 107 C compressor frequency will be reset based on the OD ambient set and room temperature Service Manual SM Inverter i 13 OVERALL CURRENT CONTROL To monitor the overall current and to restrict the compressor upper limit rotation in order to prevent circuit breakers from exceeding the rated capacity Detected during compressor running Current stop zone L1 Frequency zone L2 Frequency remain zone L3 Reset zone mw j ARXN RXN25 9 5A ARXN RXN35 10 0A ARXN 50 12 0A ARXN RXN60 12 0A When the input current for running compressor exceeds L2 running frequency will be reduced by 1 step If current still exceeds L2 frequency will be reduced by another 1 step until total current falls between L2 and L3 This protection cut in when the input current exceeds L1
4. 01 3 49E 01 3 33E 01 3 18E 01 3 04E 01 2 90E 01 2 78E 01 2 66E 01 2 54E 01 2 432 01 2 332 01 2 23E 01 2 14E 01 2 05E 01 96E 01 88E 01 80 01 73E 01 66E 01 59E 01 53E 01 47E 01 41E 01 35E 01 30E 01 25E 01 20E 01 16 01 11E 01 07 01 O3E 01 9 90E 00 9 52E 00 9 16E 00 8 82E 00 8 49E 00 8 17E 00 7 87 00 7 58E 00 7 31 00 7 04 00 6 79E 00 6 54E 00 6 31E 00 6 09 00 5 87 00 567 00 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Table 2 Resistance R25 20 ohm 4 53E 01 4 32E 01 4 12E 01 3 92E 01 3 74E 01 3 57E 01 3 41E 01 3 26E 01 3 11 01 2 97 01 2 84E 01 2 71 01 2 59E 01 2 48E 01 2 37E 01 2 27E 01 2 18E 01 2 08E 01 2 00E 01 91E 01 B3E 01 76E 01 69E 01 62E 01 55 01 49E 01 43E 01 37E 01 32E 01 27E 01 22 01 17E 01 12E 01 08E 01 O4E 01 1 00E 01 9 62E 00 9 26 00 8 92E 00 8 59E 00 8 27E 00 7 97E 00 7 68E 00 7 40E 00 7 14E 00 6 88E 00 6 64E 00 6 40E 00 6 18E 00 5 96 00 5 75 00 et o Service Manual SM Inverter_ i 7 50 00 7 23E 00 6 98E 00 6 73E 00 6 50E 00 6 27E 00 6 05E 00 5 84E 00 5 47E 00 5 28E 00 5 10E 00 4 92E 00 4 75E 00 4 59 00 4 44 00 4 29 00 4 15E 00 4 01E 00 3 88E 00 3 75E 00 3 63E 00 3 51E 00 3 40E 00 3 29E 00 3 18E 00 3 08E 00 2 98E 00 2 89E 00 2 80E 00 2 71E 00 2 63E 00 2 55E 00 2
5. 27 Description Low Pressure protection Supposed Cause 1 faulty high pressure switch connector or wire harness 2 Indoor filter outdoor coll dirty 3 Outdoor fan not running unit overcharge stop valve 1 closed Troubleshooting Stop valve open Open the stop valve to outdoorPCB Canned correctly Measure the voltage between low pressure switch Relation between Voltage and pressure followthe graph Changethe low pressure switch Isthe refrigerant pressure abnormally low Changethe OutdoorPCB Correct refrigerantsystem gas shortage leakage or piping block Service Manual SM Inverter i 28 Compressor Overload detected through compressor OL Supposed Cause Refrigerant Shortage 4 way valve malfunction Outdoor PCB defective Water mixed in the local piping Electronic expansion valve defective Troubleshooting off unit Disconnect Compressor wirehardness UV AW Check compressor winding resistance Resistance normal Change compressor Conned back wire and turn unit Compressor stop without running gt Changeoutdoor PCB Compressorrunfor sometimes Check EXW stop valve refrigerant level anc water inthe piping installation condition Service Manual SM Inverter i 29 Compressor lock Supposed Cause The system will be shut down if the error occurs 16 times Compressor locked Compressor harness disconnect Turn off the power D
6. 47E 00 2 40E 00 2 32E 00 2 25E 00 2 19E 00 2 12E 00 2 06E 00 2 00E 00 1 94E 00 1 88 00 1 83E 00 1 77E 00 1 72E 00 1 67E 00 1 63E 00 1 58E 00 1 53E 00 1 49E 00 1 45 00 1 41 00 1 37 00 1 33E 00 1 30E 00 1 26E 00 1 23E 00 1 19E 00 Temperature Resistance value CC Service Manual SM Inverter_ i 54
7. accumulate indoor coil Clean the indoor I Is very dirty Yes coil Y No Y Check fan blower condition Is it very dirty Clean fan blower Y Check indoor coil thermistor resistance Refer to thermistor resistance table Does it conform to the hermistor accuracy table Change indoor PCB No Y Change indoor thermistor Service Manual SM Inverter i Fan Motor or Related Abnormality Supposed Cause 1 Indoor fan motor winding short or the motor lead wire broken 2 Indoor PCB faulty Troubleshooting Change PCB and turn on power supply Service Manual SM Inverter i 23 Description Indoor Thermistor short open Supposed Cause 1 Thermistor connector faulty 2 Indoor PCB faulty Troubleshooting Check the thermistor connector condition m Correctthe problem Yes Check thermistor resistance value 2 Referthermistor resistance table Replace therrnistor Replace PCB Description Indoor Room Thermistor Short Open Supposed Cause 1 Thermistor connector faulty 2 Indoor PCB faulty Troubleshooting Check the thermistor connector condition Correctthe problem Yes Check thermistor resistance value 2 Referthermistor resistance table y Replace thermistor Repl
8. for 2 seconds ARXN RXN LV IB 9 Compressor will stop and it is considered total current overload input current L3 the compressor frequency is reset based on the OD ambient set and room temperature OIL RECOVERY CONTROL When the compressor operates for certain duration at low frequency the oil level in the compressor may become low due to incomplete oil return To prevent damage to the compressor or compressor lock due to low oil lever To promote refrigerant flow to carry the oil back to the compressor Entering condition Compressor rotation lt 35 Hz at the end of a 20 minutes timer set lower limit rotation to 35 Hz amp EXV opening is fixed at current opening 50 pulse This control is reset when rotation gt 35 Hz Service Manual SM Inverter i 14 3 0 Service Diagnosis From indoor units e When any error occurs indoor LED display will keep blinking green light The blinking pattern not indicate error details e The error details have to retrieve from handset in error code form LED blinks here Indoor Wireless Handset BRC52A61 A62 Using wireless handset BRC52A61 A62 to retrieve error code ON TIMER CANCEL OFF TIMER CANCEL 1 Hold down ON TIMER CANCEL OFF TIMER CANCEL 5 seconds until uL indication flashes on the handset temperature display section 2 Then press the same button repeatedly A series of error code will appear until
9. indoor unit PCB mounted Indoor unit PCB defective Wrong outdoor unit PCB mounted or defective Troubleshooting Check the models number Check the combination of the models Service Manual SM Inverter i 48 4 0 Wiring Connection ATXN 25 35 LVIB 9 amp ARXN 25 35 LV 18 9 49 i i i i i i i i I i i i i i i i i I i i i L Service Manual SM Inverter_ i ATXN 50 60 LVIB 9 amp ARXN RXN50 60 LV 18 9 Service Manual SM Inverter i 50 Refrigerant Diagram ATXN FTXN 25 35 50 60 LV 1B 9 Service Manual SM Inverter_ i 51 25 35 50 60 LV1B 9 PIPING GAS AIR THERMISTOR HEAT EXCHANGER INDOOR UNIT HEAT EXCHANGER THERMISTOR PIPING LIQUID INDOOR UNIT Appendix Resistance value when 25 C Service Manual SM Inverter i DISCHARGE PIPE n 3 WAY VALVE MUFFLER THERMISTOR um a uj T 2 z ACCUMULATOR OMPRESSOR ELECTRONIC EXPANSION VALVE STRAINER COOLING OPERATION N HEATING OPERATION AIR THERMISTOR gt HEAT EXCHANGER OUTDOOR UNIT HEAT EXCHANGER THERMISTOR L K lt STRAINER OUTDOOR UNIT 52 Ceiling Concealed Ceiling Cassette ee Table 1 Resistance R25 10K ohm 4 42E 01 421 01 4 02E 01 3 83E 01 3 66E
10. 5 not able to restart with last state memory after power resume from failure Unit will revert to default setting as below Default setting Unit Off Temperature 24 Fan speed High Mode Cooling Service Manual SM Inverter i 3 2 0 Algorithm and Control INDOOR BASIC FUNCTIONS Residential and Light Commercial The system has 5 operating modes The mode selection is done from indoor using handset The operating modes are Cool Heat e Fan e Auto e Dry Cool Mode When Ir Ts 1 5 Comp Indoor Fan and Outdoor Fan ON When Tr lt Ts 2 C Compressor and Outdoor Fan OFF Tr Room Temperature Ts Set Temperature When cooling load 1 too small and the room temperature still fall ng below compressor cut off point compressor will stop Compressor Capacity Lowest Freq Tr lt Ts 2 C Comp will stop Service Manual SM Inverter i Heat Mode When Ts gt Tr 1 0 C Comp ID Fan and OD Fan ON When Tr gt Ts 1 5 Compressor and Outdoor Fan OFF e Indoor Fan off if indoor coil lt 20 Room Temperature Ts Set Temperature When heating load is too small and the room temperature still rising above compressor cut off point compressor will stop Compressor Capacity Lowest Freq Tr Ts gt 1 59 Comp will stop FAN MODE Only High Medium and Low fan speeds are allowed When changing cool mode to fan mode compressor wil
11. GBT error Supposed Cause Over current due to defective power transistor Over current due to wrong internal wiring Over current due to abnormal supply voltage Over current due to defective PCB Error detection due to defective PCB Over current due to closed stop valve Over current due to compressor failure Over current due to poor installation condition Connection between main board and IPM board is not properly connect stop valve fully open Open stop valve Yes Turn offthe unit and turn back after 20 mins Troubleshooting Continue monitor for supply voltage discharge Error again suction pressure compressor overload Check for silicon grease IPM condition Yes Turn aff the unitanddisconnect compressor LI V VV wire Check compressor windinaresistance Resistance Change compressor Yes Changethe Outdoor PCB Service Manual SM Inverter i 43 Supposed Cause Refrigerant shortage Refrigerant leakage Stop valve closed defective Discharge pipe thermistor defect Indoor and outdoor unit coil thermistor not actual location or defect Service Manual SM Inverter 14 Troubleshooting Service Manual SM Inverter_ i Check stop valve Stop valve Yes Y closed No Check indoor and outdoor coil thermistor Thermistor in No Fully open stop valve ctual position Yes
12. HERMISTOR me Rm Discharge pipe Used for discharge superheat SH amp EXV control Used for defrost control Also used for Inverter current protection control in Outdoor coil Series II Used defrost amp outdoor fan speed control Also used for overall Outdoor atr U current protection amp preheating operation control Used for capturing heat s nk temperature Used for SH amp suction pipe SH protection control heating Used gas pipe isothermal control in cooling EX V opening is controlled so that accurate cooling capacity 15 achieved in each room Used for sub cooling control in heating Actual sub cooling will be calculated with liquid pipe amp max heat exchanger temperature among all rooms EXV opening is then adjusted to reach the target sub cooling Service Manual SM Inverter i MINIMUM RUN CONTROL To prevent frequent compressor ON OFF to allow pressure equalization The compressor will be on 3 minutes stand by after turning OFF before it is allowed to turn ON OD fan OFF delay to improve pressure equalization amp to prevent refrigerant from entering into evaporator AUTO RESTART Factory pre set Allow unit to automatically resume the same operating mode it was in before a power failure 4 WAY VALVE CONTROL Change over switching 15 only carried out during operation OFF delayed is applied when the coil switches from ON to OFF Heat
13. ID buzzer produces a long beep The corresponding error code 1s indicated on the handset temperature display section Service Manual SM Inverter i 15 3 ID unit buzzer will produce a long if handset error code matched with unit error 4 short and two consecutive beeps 15 Not unit error 5 code display will cancel itself if the button is not pressed for 1 minute How to Retrieved Last State Error Remove battery from remote controller 2 Replace battery again into remote controller 3 Press Mode amp ON OFF buttons together 4 The 00 will show at temperature section 5 Press Mode button to 5 00 6 Press Power On toward the indoor unit Unit LED blinks two times indicate received signal 7 ON hold fan button till screen become normal display 8 Repeat the normal step to retrieve error by using remote controller step Holding TIMER CANCEL 9 Byusing this method the error shown will be Last State Error Previous error in this unit Mode button OFF TIMER CANCEL ON OFF button ON TIMER CANCEL L Service Manual SM Inverter_ i 16 Using wired handset BRC51A61 A62 The error will show at the LCD display BRCSIA6I1 can retrieved last state memory by Press SLEEP amp TIMER ACTIVE simultaneously for 5 seconds and the error will be flashed Co J amp 14 uum Lor v oN GOFF S
14. LEEP m mm L mm umm um F AN Service Manual SM Inverter_ i 17 Error code description for Inverter No ERROR CODE ERROR DESCRIPTION RXN50 60 LV1B 9 RXN25 35LV1B 9 ER AIR SWING MOTOR INDOOR HEAT EXCHANGER THERMISTOR SHORT OPEN n INDOOR ROOM THERMISTOR SHORT OPEN e SI ON N p T OUTDOOR PCB ERROR T COMPRESSOR OVERLOAD COMPRESSOR LOCK START UP ERROR OUTDOOR FAN MOTOR LOCK AC INPUT OVER CURRENT AWAY VALVEERROR DISCHARGE PIPE OVERHEAT HEAT EXCHANGER COMPRESSOR SENSOR SYSTEM ABNORMAL POSITION SENSOR ABNORMAL T1 m ON compressor Service Manual SM Inverter_ i CURRENT SENSOR ERROR OUTDOOR AIR THERMISTOR SHORT OPEN COMPRESSOR DISCHARGE PIPE THERMISTOR SHORT OPEN MISPLACED OUTDOOR HEAT EXCHANGER THERMISTOR SHORT OPEN ELECTRICAL BOX TEMPERATURE RISE L3 compressor off x SINK compressor on 4 IPM ERROR IGBT ERROR output L5 over current y SINK THERMISTOR SHORT OPEN INSUFFICIENT GAS DC VOLTAGE OUT OF RANGE COMMUNICATION ERROR INSTALLATION ERROR Service Manual SM Inverter i 19 Error Code Indoor unit PCB abnormality Supposed Cause 1 Faulty PCB 2 Faulty connector connection at
15. Y Check indoor coil outdoor coil and discharge pipe thermistor resistance Resistance No Put the thermistor back to actual position normal Yes v Check EXV EXV No Y Change thermistor functioning Yes v Check refrigerant charge level No Change EXV sufficient Yes Change outdoor PCB Check for leakage Any leakage No v Add refrigerant charge Yes gt Repair the leak point 45 DC voltage out of range Supposed Cause Supply voltage not as specified DC voltage detection circuit defective Troubleshooting Check the supply voltage Supply voltage as Correct the specified power supply Change outdoor PCB Description Communication error between indoor and outdoor Supposed Cause Faulty outdoor unit PCB Faulty indoor unit PCB Indoor unit outdoor unit signal transmission error due to wiring error Indoor unit outdoor unit signal transmission error due to disturbed power supply waveform Indoor unit Outdoor unit signal transmission error due to breaking of wire in the connection wires between the indoor and outdoor units Troubleshooting Service Manual SM Inverter i 46 Service Manual SM Inverter i 47 Supposed Cause Wrong models Interconnected Wrong
16. ace PCB Service Manual SM Inverter i 24 Air intake gap for room RTH201 temperature sensing Unit design with air opening at the front panel to allow sufficient space for air flow and measurement Outdoor PCB error Supposed Cause 1 Micro Controller program run away due to external factor such as Noise Momentary voltage drop Momentary power failure 2 Damage of EEPROM 3 Faulty outdoor unit PCB Troubleshooting Check the outdoor condition Power on and off again Error Again Replace outdoor PCB Carry grounding work Unit is grounded Investigate the cause of noise Avoid device near to high interference place Change Outdoor PCB Service Manual SM Inverter i 25 Service Manual SM Inverter i 26 Hieh Pressure protection Supposed Cause 1 faulty high pressure switch connector wire harness 2 Indoor filter outdoor coll dirty 3 Outdoor fan not running unit overcharge stop valve 15 closed Troubleshooting Check the installation condition Stop valve open _ Open the stop valve Pressure switch conner to outdoorPCB conned correctly Turn aff unit Waitfor compressor stop 10 minutes ave continuity for high u 22 pressure Replace high pressure switch Check the abnormal unit hiah pressure condition Have abnormal condition gt Correctthe abnormal condition Replace outdoor PCB Service Manual SM Inverter i
17. ed loose 7 gt gt Connedthermistor back Check thermistor resistance Refer thermistor specand the table Resistance valuenormal Changethermistor Changeoutdoor Service Manual SM Inverter i 40 Outdoor control box overheat Supposed Cause Fin temperature rise due to defective outdoor unit fan Fin temperature rise due to short circuit Fin thermistor defective Connector in poor contact Outdoor unit PCB defective Troubleshooting Turn off the unit andturn on back after 20 mins Check outdoorfan Referthermistor specand tha table Yes il Change outdoor Check heatsink themistor resistance fan motor EN ik rity Changethermistor ra condition Yes ChangeoutdoorPCB eK Clean the heatsink Changeheatsink or check outdoorfan conditio Service Manual SM Inverter i Heat sink overheat Supposed Cause Fin temperature rise due to short circuit Fin temperature rise due to defective outdoor unit fan Fin thermistor defective Connector in poor contact Outdoor unit PCB defective Silicon grease is not applied properly on the hat radiation fin after replacing outdoor unit PCB Troubleshooting Tum of the unit and tum on back after 20 minutes tanmistor resistance talo ne a the baat Sink Service Manual SM Inverter i 42 IPM error I
18. er Compressor faulty Change outdoor Control Box Service Manual SM Inverter_ i Replace the outdoor unit Refer to the type of abnormality and conduct proper service Change Compressor 32 Supposed Cause EXV faulty EXV connected wrongly Troubleshooting 5 the EXV connector connects correctly Reconnect Turnthe power off and E ee Outdoor unit PCB is faulty sound EXV unit is faulty Description 4 way valve error Supposed Cause Thermistor defective Connector in poor contact 4 way valve defective Outdoor PCB defective Insufficient gas Foreign substance mixed in refrigerant Service Manual SM Inverter i 33 Troubleshooting Yes 4 way valve coil or harness disconnected loose Reconnect Check the continuity of the 4 way valve coil and harness Disconnect the harness from the connector Resistance between harness about Replace the 4 way valve coil Check the 4 way valve Replace outdoor switching output unit PCB Functioning Any thermsistor disconnected Yes Replace the defective thermsistor Thermistor functioning Yes Refrigerant line blockage or shortage Correct the problem Replace the 4 way valve Service Manual SM Inverter i 34 Discharge pipe overheat Supposed Cause Refrigerant shortage Four way valve malfunctioning Discharge pipe thermistor defective Outdo
19. except for defrost Cool Dry OFF Defrost DEFROST CYCLE During defrost RXN LV 1B 1B9 EXV in operation room Fixed opening Service Manual SM Inverter i 8 ATXN FTXN LV and ARXN RXN LV 1B 1B9 DEFROST CONTROL Condition for entering defrost Compressor minimum run time 6 minutes OR Compressor accumulated run time of 45 minutes if Outdoor coil lt 3 C Condition for terminating defrost OD coil gt 12 C or e Total defrost timer of 650 seconds OUTDOOR FAN CONTROL Determine from e Compressor target rotation higher fan speed with higher rotation Outdoor air temperature Cool mode Higher fan speed with higher outdoor air temperature Heat mode Higher fan speed with lower outdoor air temperature When compressor stops fan OFF delay 30 seconds is carried out INDOOR COIL FREEZE PREVENTION Only available in cooling mode When the indoor coil temperature lt 2 C the compressor starts to drop the frequency This protection will cut in when Indoor coil temperature lt 0 C for more than 180s Compressor will stop OD fan stop after 30s and indoor fan can only run at lowest fan speed The unit can only be restarted after 3 minutes When the indoor coil temperature gt 13 C the compressor frequency will be reset based on the OD ambient room and set temperature Service Manual SM Inverter i 9 REGULATING FUNCTIONS Upper limit rotation
20. indoor Troubleshooting Turn off unit Check indoor PCB connector conditions including FCE to terminal block PCB wire connector Any sign of loose or abnormal gt Conned correctly and operate again Replace indoor FCB andoperate again Water Pump Error Supposed Cause 1 Faulty drain pump or float switch 2 Improper drain piping work or drain pipe blockage Troubleshooting UU Check drainpump connector connact to indoor PCB sign of looseor abnormal Conned correctly and operate again Restartback operation Service Manual SM Inverter i 20 Drain pump works Change drain pump YES Drain water level abnormal high Float switch after sometimes the PCB gt Connedfloat switch Drainage system problem or blockage Be Checkfloatswitch continuity Changefloat switch Changeindoor FCB Anti freeze protection or High Pressure Control Supposed Cause 1 Indoor air filter heat exchanger block due to dust accumulation 2 Indoor air short circuit 3 Indoor coil thermistor faulty 4 Indoor faulty 5 Fan blower dirty Troubleshooting Refer to next page Service Manual SM Inverter i 21 Check indoor air flow Any air short Yes Provide sufficient circuit air passage No Y Check intake air filter Is it very dirty gt Clean the air filter No Y Check the dust
21. isconnect the harness U V and W Check with the inverter checker lt gt AO Correct the power supply Yes Turn off the power and reconnect the harness Turn on the power again and get the system restarted Troubleshooting Emergency stop without compressor Replace the compressor running System shut down Check the EXV and after errors repeated replaced if required several times Replace the compressor Service Manual SM Inverter i 30 DC Fan Lock Supposed Cause Fan motor breakdown Harness or connector disconnected between fan motor and PCB or poor contact Troubleshooting Fan motor connector Turn off the power and disconnected reconnectthe connector Y Foreign matters in or z Remove around the fan Checkthe outdoor unit PCB rprn pulse input Replacethe outdoor unit Pulse signal inputted fan motor Replace the outdoor unit PCB Service Manual SM Inverter_ i 31 Input Over Current Detection Supposed Cause over current due to compressor failure over current due to defective outdoor unit PCB over current due to defective power transistor over current due to short circuit Troubleshooting Measure the input current Input current flowing above its stop level Check outdoor fan motor outdoor ambient temperature refrigerant charge level Any abnormal Turn off the power and disconnect the harness U W Check with the inverter check
22. l stop and OD fan stops based on fan OFF control Compressor only ON if the minimum stop time is gt 3 minutes and the user change back to cool mode Fan speed will maintain same as during fan mode AUTO MODE For heat pump only Mode switching point Heating Cooling gt Tr gt Ts 2 5 Cooling gt Heating gt Tr lt Ts 2 5 During initial operation e Cooling operation Tr gt Ts Service Manual SM Inverter i 5 e Heating operation Tr lt Ts ID OD COMMUNICATION Master by outdoor unit Indoor controller board will transmit signal to outdoor controller board every 0 5s Outdoor unit will response to indoor once the valid data is received Indoor l oe pes Xo fee S Ifthe data communication line between indoor and outdoor disrupted for 15s continuously compressor will stop OD fan stop with fan OFF timer ID LED blinks error If communication resumes within 15s error code is clear and compressor restarts after 3 minutes If communication does not resume after 15s unit unable to restart and the error keep blinking Service Manual SM Inverter i 6 THERMISTORS IN ARXN RXN LV1B Q9 4 la 1 x i F i gt lt wu STEER HDOOR UNIT QUTDOOR UNIT FUNCTIONS T
23. normal I Conned back reactor Check reactor resistance Check reactor resistance Changereactor Check compressor resistance Changecompressor Yes Changeoutdoor PCB Service Manual SM Inverter_ i 37 Compressor feedback detection error Supposed Cause Compressor relay cable disconnected Compressor itself defective Outdoor PCB defective Stop valve closed Input voltage out of specification Troubleshooting Check for short circuit Replace the outdoor unit PCB outdoor unit fan Compressor harness connected as specified Reconnect as specified Turn off the power Disconnect the harness U W Check with inverter checker Service Manual SM Inverter i 38 Internal wiring broken Outdoor unit PCB defective Troubleshooting Service Manual SM Inverter_ i 39 Description Thermistor or related abnormality H9 Outdoor atr thermistor short open J3 Compressor discharge pipe thermisotr short open J5 Suction pipe thermistor short open J6 Outdoor heat exchanger thermistor short open J7 Subcooling heat exchanger thermistor short open 18 Liquid pipe thermistor short open J9 Gas pipe thermistor short open P4 Heat sink thermistor short open Supposed Cause Connector in poor contact Thermistor defective Outdoor PCB defective Indoor PCB defective Check connector forthe thermistor with error Troubleshooting hermistor disconnect
24. or PCB defective Water mixed in the local piping defective Stop Valve defective Troubleshooting Resistance value Normal Changedischargethermistor Check refrigerantlevel compressor EXV amp stop valve Heat exchanger overheat Supposed Cause The installation space is not large enough Faulty outdoor unit fan Faulty EXV Faulty defrost thermistor Faulty stop valve Dirty heat exchanger Unit overcharge Working out of operating limit Service Manual SM Inverter i 35 Troubleshooting Check outdoor installation condition Change outdoor location Clean outdoor coil Y Any abnormal Yes No Y Check outdoor fan motor Fan motor running smoothly No Y Change fan motor Yes Y Check outdoor coil thermistor resistance Refer thermistor resistance table Resistance normal No p Change thermistor Yes Check refrigerant level EXV stop valve and condenser ambient temperature Refer to the type Any abnormal Yee of abnormality and proper service No Y Change outdoor PCB Service Manual SM Inverter_ i Description Compressor sensor system error Supposed Cause Reactor disconnection Compressor disconnection Outdoor untt PCB defective Compressor defective Troubleshootine Check reactor connection Any ab
25. um value was determined among the lower limits rotation 1 e protection controls Generally compressor rotation is controlled within 4 zones stop drop keep up and reset subjected to a particular operating temperature current pressure Compressor is stopped when a certain limit reaches stop zone for abnormality correction Frequency will be dropped with a timer setting Frequency is maintained at lower upper limit Frequency will be increased with a timer setting Frequency lower upper limit is canceled and returned to command rotation HIGH PRESSURE PROTECTION To prevent high pressure in the system Compressor operating frequency is adjusted based on upper limit of coil temperature Upper Limit Coil Temperature 64 C Compressorfrequency The compressor frequency is adjusted based coil temperature e During cooling mode outdoor coil temperature e During heating mode indoor coil temperature This protection is activated when the coil temperature gt 64 the compressor stop and OD fan stop after 30s The unit can only be restarted after 3 minutes Service Manual SM Inverter i 12 DISCHARGE TEMPERATURE CONTROL Used as a measure of the compressor s Internal temperature Compressor frequency is control to keep this temperature from going up further when it rises above certain level Discharge temperature Stop zone 110 C 120 C 102 C 111
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