IHM 09-12-18 mono inverter
Contents
1. Replace the outdoor power supply board Replace the outdoor main PCB 13 1 3 Display LED STATUS Is power supply right Yes Yes Replace the indoor control board 13 1 4 Display LED STATUS Fan speed beyond control 33 Service manual Is connector connection good Yes Is voltage being applied to the fan motor No Repair the connector No Yes Indoor fan motor is defective Indoor PCB is defective rang 90v 160v between mid pin and N on CN1 Replace indoor fan motor Replace indoor main PCB 13 1 5 Display LED STATUS Open or short circuit of outdoor temperature sensor Is connection to connector good Yes Replace the sensor Repair connector If display E5 all the same replace indoor main PCB 13 1 6 Display LED STATUS Room temperature or evaporator temperature sensor open or short circuit Is connection to connector good yes No Replace the sensor Repair connector If display E6 all the same replace outdoor main PCB 13 1 7 Display LED STATUS po EEEE 34 Service manual Is connection to connector good O Is the wires to compressor right Yes Yes Check the voltage between P and N on inverter module Is it about 380V No Yes Test the outdoor power supply board again Check the inverter module If some component cracked or damaged Yes Inverter module damaged replace it Is it breakdown between P N P U P2. Service manual 13 Troubleshooting 13 1 Indoor Unit Error Display o Eerme OOOO Er indoor outdoor units communication protecton EZ Zero crossing examination eror Es Fan speed beyond conr SS Es Open or short circuit of outdoor temperature sensor Es Room temperature or evaporator temperature sensor open or short crcl of PO moaue proteo O Pr Over votage or too ow votage protection P2 Compressor top protection against temperature Pa ouor iow temp protection Inverter compressor drive error Note E4 Reserved function EO E1 E2 E3 E5 E6 P1 P2 P3 4 13 1 1 Display LED STATUS EEPROM parameter error Circuit or software error on indoor control board Replace the control board of indoor 13 1 2 circuit or software error on indoor cortrol board Display LED STATUS Indoor outdoor units communication protection 32 Service manual Disconnect the power supply after 1 minutes connect the power supply turn on the unit using remote controller does the unit work normally NO Is the connection on outdoor control board and between indoor and outdoor unit good Does the L Boge elec on DUOT CONTOLDOATU OMONE N connect good Does the S wire connect reliably NO Is the voltage on terminal CZ1 and CZ2 of the outdoor main PCB is 5V No Is the voltage between P and Yes Replace the module board The N on inverter module 380V power supply of PCB is supplied by the module board
3. V N W N U N V At inverter module No Check compressor 13 1 8 Display LED STATUS Over voltage or too low voltage protection Yes Inverter module is defective Is the power supply right Check the outdoor power board Replace outdoor main PCB 13 1 9 Display LED STATUS Compressor top protection against temperature Off 115 C On 100 C 35 Service manual Does compressor operate N O Is the connection good Yes Is refrigerant circulation volume normal No No Yes Connect and test again Gas charging Is protector normal No Yes Is abnormality the same after gas charging Replace protector Check the outdoor main PCB Check refrigerant system such as clogging of Replace the outdoor main PCB 13 1 10 Display LED STATUS Outdoor low temp protection This is optional factory standard unit has not this function Unit stops when outdoor temp is low than 15 C and lasting time more than 60 minutes and unit runs again when outdoor temp more than 12 C Is the outdoor temp low than 15 C Replace the outdoor main board 13 1 11 Display LED STATUS Are the U V W connected to compressor and inverter module right And is the compressor feed back wires CN514 connected to PCB qood Service manual Reconnecting Replace outdoor main PCB If the problem can not be solved replace inverter module 2 If the problem comes to again check wingding resistance of
4. inverter compressor is it 0 64 ohm Replace inverter compressor O 13 2 Diagnostic chart After energizing no indicator is lighted and the air conditioner can t be operated 37 Service manual After energizing the air conditioner can not be operated Check if AC 220V power supply outputs to indoor PCB Yes Check if AC 220V exists at the primary coil of transformer P d Indoor PCB is defective l Check if AC 14 5V exists at the secondary coil of transformer Yes No Y Take off the secondary plug of transformer and then check if AC 14 5V exists at the secondary coil of transformer ee No y Indoor PCB is defective Indoor PCB is defective 38 Service manual 13 3 Resetting phenomenon often occurs during operation That is automatically entering to the status when power is on The reason is that the instantaneous voltage of main chip is less than 4 5V Check according to the following procedure Resetting phenomenon often occurs during operation Yes After changing indoor PCB check if the failure realease ggi Yes Indoor PCB is defective After changing indoor fan motor check if the failure realease YES l Power supply circuit has problems 13 4 Operation lamp flashes and Timer lamp off Is connector con
5. nection good Is voltage being applied to the fan motor Fan motor is defective 13 5 Operation lamp flashes and Timer lamp on Is connector connection good Replace the sencor 39 Repair the connector Service manual 13 6 Operation lamp off and Timer lamp flashes Operation lamp off and Timer lamp flashes After changing the main control board check if the failure realease N Indoor PCB is defective The voltage of power supply is too low less than 187V No Outdoor unit fault such as the compressor Power supply fault 13 7 Operation lamp on and Timer lamp flashes EEROM error indoor PCB is defective 13 8 Operation lamp flashes Timer lamp flashes This is alarm signal when the main chip can t detect over zero signal When such failure occurs the main control board must have fault Service manual 14 Characteristic of temperature sensor 41 9 58 7079 18 13 918 45 4 2126 8 56 3694 19 13 2631 46 4 0459 6 49ate1 21 12 0561 48 3 7348 o 35 2024 27 9 1245 54 2050 6 25 4954 33 6 9814 0 2 8577 8 225662_ 35 64002 62 2 1907 9 21 8094 36 6 1306 63 2 1124 42 18 7177 39 53969 6 1 8963 67 14 16 9341 41 49639 j6s 17665 a5 16 1156 42 4 762569 1 7055
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