Service Manual 9. Troubleshooting

1 23 Installation and MaintenanceService Manual9. Malfunction IndicatorThe error code will be displayed on the wired controller and the main board of the outdoor meaning of each error, as shown in table of malfunctionThe indicator displayIndoor displayYellow lightRed lightGreen lightCompressor runsFlash onceDefrostFlash twiceH1 Anti-freezing protectionFlash 3 timesE2 IPM protectionFlash 4 timesH5AC over-current protectionFlash 5 timesE5 Over-burden protectionFlash 6 timesH4 Compressor exhaust high temperature protectionFlash 7 timesE4 Compressor overload protectionFlash 8 timesH3 Power protectionFlash 9 timesL9 EEPROM reads and write protectionFlash 11 timesLow PN voltage protectionFlash 12 timesPLOver voltage protection for PNFlash 13 timesPHPFC protectionFlash 14 timesHCPFC module temperature protectionFlash 15 timesoELow pressure protectionFlash 17 timesE3 High pressure protectionFlash 18 timesE1 Limit/decline frequency(electric current)Flash 1 timesFrequency limit(exhaust)Flash 2 timesFrequency limit(Over-burden)

2 Flash 3 timesOutdoor ambient sensor malfunctionFlash 6 timesF3 Outdoor tube sensor malfunctionFlash 5 timesF4 Exhaust sensor malfunctionFlash 7 timesF5 Attain the temperature of switch onFlash 8 timesFrequency limit(power)Flash 13 timesOutdoor fan malfunctionFlash 14 timesFrequency limit(PFC module temperature)Flash 15 timesPFC module sensor malfunctionFlash 16 timesoELiquid pipe temperature sensor malfunction of AFlash 17 times24 Installation and MaintenanceService Manual14/18K:24/28K:43 Communication failure with Unit A 44 Communication failure with Unit B 45 Communication failure with Unit C 46 Communication failure with Unit D 47 Unit A freeze protection 48 Unit B freeze protection 49 Unit C freeze protection 50 Unit D freeze protection 51 Unit A overheating prevention protection 52 Unit B overheating prevention protection 53 Unit C overheating prevention protection 54 Unit D overheating prevention protection 55 Unit A communication wire misconnection or expansion valve malfunction 56 Unit B communication wire misconnection or expansion valve malfunction 57 Unit C communication wire misconnection or expansion valve malfunction 58 Unit D communication wire misconnection or expansion valve malfunction Note.

3 Discharge the position in below pictures with discharge resistance after open the top cover and check if the voltage is below 20V with universal meter, then begin to check. 1 IPM protection malfunction: Main checking point: If the input voltage of the unit is within normal range? If the connection wire of compressor is connected well? Is it loose? If the connection sequence is correct? If the resistance of compressor coil is normal? If the isolation of compressor coil with copper pipe is good? If the unit is overloaded? If the heat radiation of the unit is good? If the refrigerant charge is suitable? Flow chart: Malfunction Checking and Elimination14/18K:24/28K:43 Communication failure with Unit A 44 Communication failure with Unit B 45 Communication failure with Unit C 46 Communication failure with Unit D 47 Unit A freeze protection 48 Unit B freeze protection 49 Unit C freeze protection 50 Unit D freeze protection 51 Unit A overheating prevention protection 52 Unit B overheating prevention protection 53 Unit C overheating prevention protection 54 Unit D overheating prevention protection 55 Unit A communication wire misconnection or expansion valve malfunction 56 Unit B communication wire misconnection or expansion valve malfunction 57 Unit C communication wire misconnection or expansion valve malfunction 58 Unit D communication wire misconnection or expansion valve malfunction Note.

4 Discharge the position in below pictures with discharge resistance after open the top cover and check if the voltage is below 20V with universal meter, then begin to check. 1 IPM protection malfunction: Main checking point: If the input voltage of the unit is within normal range? If the connection wire of compressor is connected well? Is it loose? If the connection sequence is correct? If the resistance of compressor coil is normal? If the isolation of compressor coil with copper pipe is good? If the unit is overloaded? If the heat radiation of the unit is good? If the refrigerant charge is suitable? Flow chart: Gas pipe temperature sensor malfunction of AFlash 18 timesLiquid pipe temperature sensor malfunction of BFlash 19 timesGas pipe temperature sensor malfunction of BFlash 20 timesLiquid pipe temperature sensor malfunction of CFlash 21 timesGas pipe temperature sensor malfunction of CFlash 22 timesLiquid pipe temperature sensor malfunction of DFlash 23 timesGas pipe temperature sensor malfunction of DFlash 24 timesLiquid pipe temperature sensor malfunction of EFlash 25 timesGas pipe temperature sensor malfunction of EFlash 26 timesExit of the condenser tube sensor malfunctionFlash 27 timesCorrespondence is normalFlash 7 times(n=indoor unit number)Communication failure between indoor unit and outdoor unit Often bright(indoor unit all Communication failure)

5 Indoor ambient sensor malfunctionF1 Indoor evaporate sensor malfunctionF2 Mode conflictE7 Accept fluorine modeFoJumper cap malfunction protectionC5 Anti-freezing protectionFH25 Installation and MaintenanceService ManualEnergize the unitIf the above cases are existed?Test the isolation impedancebetween the three phases of the compressor and thecopper pipeMalfunction is eliminatedEndIf the wire of compressor is connected well and correctly?Correct according to the Service Manual and then energize the unit to operateTest the resistance betweenthe three phases Reconnect the wire of thecompressor according to the correct wiring method If the resistance is normal?If the resistance is above 500M ?Replace the compressorReplace the outdoor mainboard Please check: 1. if the indoor and outdoor heat exchanges are dirty, if there is obstacle to affect the radiation; 2. if the indoor and outdoor fans are running normally; 3.

6 If the pressure of the system is too high; 4. if the refrigerant is too much which causes the high level of pressure; YesYesYesYesYesNoNoNoNoNo26 Installation and MaintenanceService Manual2. PFC protection malfunction, capacity charging malfunctionMain checking points: If the mainboard is broken;If the wiring of the induction is connected well and if the induction is broken;Flow chart:StartCheck if power supply is normalPower supply is abnormal?Turn on the unitafter power supply resumes normalReplace the outdoor mainboardEndYesNoStartCheck If the power supply is normalPower supply is abnormalCheck if the outdoor induction is brokennoitcudni eht ecalpeRnekorb si noitcudni ehTReplace the outdoormainboardMalfunction is eliminatedEndTurn on the unit after thepower supply resumes tonormal situationYesYesYesNoNoNo27 Installation and MaintenanceService desynchronizing malfunctionMain checking points: If the eletric expansion valve is working normally or it is broken;If the pressure of the system is too high;If the radiation of the unit is good;Flow chart:Eliminate the malfunctionEliminate the malfunctionEliminate the malfunctionReplace the compressorEndThe unit appears desynchronizing as soon as energizing and startingThe stop duration of the compressor is longerthan 3min?

7 The wiring of the compressor is connected properly?Reconnect the wire properlyThe eletric expansion valve is broken?Replace the eletric expansion valveReplace the outdoor mainboardNoNoNoNoNoNoYesYesYesYesYesYes2 8 Installation and MaintenanceService ManualDesynchronizing happens during operationOutdoor unit is working?Unit radiation is good?EndReplace the compressorEliminate the malfunctionReplace the outdoor mainboardReplace the outdoor unitReplace the fan capacitorRefrigerant amount is too much?Input voltage is normal?connected wellCheck if fan terminal is Improve radiation situation of the unit(such as cleaningthe heat exchanger, improve ventilationTurn on the unitafter the power supply voltage resumes normalCharge refrigerant according to the Service manualYesYesYesYesYesNoNoNoNoNo29 Installation and MaintenanceService Manual4. Compressor overload, diacharge protectionmalfunctionMain checking points: If there is refrigerant leakage;If the eletric expansion valve is connected well or it is broken;If the overload protector is broken;Flow chart:Eliminate the malfunctionEndReplace outdoor mainboardStartIf the overload protector is connected well?)

8 Check the resistance between the twoends of the overload protector in ambient temperature,if the resistance is below 1kIf the wiring of the eletric expansion valveis coonected well?Replace theoverloadprotectorCheck the coil of the eletric expansion valve, replaceit if it is brokenEliminate the malfunctionReconnect accordingto the wiring diagramCheck the refrigerant status, if there is refrigerant leakage, recharge it according to the Service manualNote: the detection method of the coil of the eletric expansion valve: there is five pieces of coil of the eletric expansion valve,the resistance of one of them (the leftmost or the rightmost one) is almost the same as the resistance of other terminal (within100). Judge the condition of the electronic expansion valve through detecting these and MaintenanceService Manual5. Start failuremalfunctionMain checking points: If the stop duration of the compressor is sufficient;If the connection wire of the compressor is connected properly;If the compressor is broken;Flow chart:If the refrigerant charging amount is too much.

9 Energize and start the unitIf the stop duration of the compressoris longer than 3minIf the connection wire of the compressoris connected well and correctlyEliminate the malfunctionReconnect the connection wireof the compressor accordingto the wiring diagramIf the refrigerant charging amount is too muchCharge the refrigerantaccording to theservice manualEliminate the malfunctionEliminate the malfunctionReplace the compressorEndReplace the outdoor mainboardThe stop duration of the unit is not enough, the high and lowpressure of the system is notbalanced,restart it after 3minNoNoNoNoNoNoYesYesYesYesYesYes31 Installation and MaintenanceService ManualStartCheck whether the wiring terminal between temperature sensor and controller is loosened or poorlycontacted?Insert the temperaturesensor tightlyEliminate themalfunctionCheck whether the temperature senspr is normal according toresistance tableReplace the temperature sensorwith the same modelReplace the controller withthe same modelEndEliminate the sensor malfunctionMain checking points: If the terminal of the temperature sensor is loosended or not connected;If the temperature sensor is damaged or broken;If the mainboard is broken;Flow chart:YesYesYesYesNoNoNoNo32 Installation and MaintenanceService Manual7.

10 DC fan malfunctionMain checking points:If the outdoor fan is blocked by foreign objects;The connection wire of DC fan is connected reliably? If it is loose?Flow chart:StartEndReplace the outdoor mainboardIf the connection wire of DC fan is loose?Check if the outdoor fan is blocked by foreign objects?Turn on the unit after removing the foreign objectsTurn on the unit after the connection wire is properly connectedYesYesNoNo33 Installation and MaintenanceService Manual8. Communication malfunctionMain checking points: If the indoor mainboard or outdoor main board is broken;If the connection wire between the indoor unit and outdoor unit is connected well, if the wires inside the unit is connected well;Flow chart:Eliminate the malfunctionEndCommunication malfunction of someindoor unitsDe-energize,check if the connectionwire of indoor and outdoor unit andthe wire of the eletric box isconnected correctlyConnected correctlyReconnect according to the wiring diagramDe-energize, change the communication wire of the well-communicated indoor unit and malfunction indoor unit,then energize the unit and wait for 3minThe malfunction indoor unitresumes normalReplace outdoor mainboardReplace the mainboard of the malfunction indoor unitNoNoNoYesYesYes34 Installation and MaintenanceService ManualEliminate the malfunctionEliminate the malfunctionEliminate the malfunctionEliminate the malfunctionEndAll the indoor units appear communication malfunctionDe-energize,check if the connectionwire of indoor and outdoor unit andthe wire of the eletric box isconnected correctlyConnected correctly?