Below is a list of the Trouble Codes displayed on the main board and Possible Reasons for the error code.
| No | LED Show | Code description | Possible Reason |
|---|---|---|---|
| 1 | P1 | High pressure switch reverse protection | High pressure switch is inserted reversely |
| 2 | P2 | Low pressure switch reverse protection | Low pressure switch is inserted reversely |
| 3 | P3 | Indoor fan overload protection | High temperature and load on evaporating side |
| 4 | P4/P5 | Low pressure switch protection for system A/B | EEV blocked/Charging leakage (low refrigerant) |
| 5 | P6/P7 | Discharge temperature protection for system A/B | High temperature and load/EEV blocked/Charging leakage (low refrigerant) |
| 6 | P8 | Discharge temperature sensor reverse protection | Discharge temperature sensor is inserted reversely/Discharge temperature sensor broken |
| 7 | PA | VFD communication fault | Connection between VFD and Main board break |
| 8 | Pb | Outdoor DC motor module communication fault | Connection between Outdoor DC motor module and Main board break |
| 9 | Pc/Pd | Evaporator freezing protection for system A/B | EEV blocked/poor heat exchange on evaporating side/over charged/low temperature on evaporating side |
| 10 | PE/PF | High pressure switch protection for system A/B | EEV blocked/High temperature and load/poor heat exchange on condensing side/compressor abnormal. |
| 11 | Ph | Ambient Temperature Limited | Ambient temperature is out of range, or T4 is abnormal. |
| 12 | PH | Low discharge superheat protection | EEV fault/poor heat exchange on evaporating side/over charged |
| 13 | H7 | P4 or P6 or PE occur 3 times within 60 minute | EEV blocked/Charging leakage (low refrigerant)/High temperature and load/load/poor heat exchange on condensing side/compressor abnormal |
| 14 | H8 | P5 or P7 or PF occur 3 times within 60 minutes | EEV blocked/Charging leakage (low refrigerant)/High temperature and load/load/poor heat exchange on condensing side/compressor abnormal |
| 15 | E01 | Power phase loss/reverse fault | Power supply is incorrect |
| 16 | E02 | Power overvoltage fault | Overvoltage of supply |
| 17 | E03 | Power undervoltage fault | Undervoltage of supply |
| 18 | E1 | Condenser coil temperature sensor fault for system A (T3-A) | T3-A sensor is short or open |
| 19 | E2 | Condenser coil temperature sensor fault for system B (T3-B) | T3-B sensor is short or open |
| 20 | E3 | The electronic expansion valve inserted loosely for system A (EEVA) | Cable of EEVA is not properly inserted |
| 21 | E4 | The electronic expansion valve inserted loosely for system B (EEVB) | Cable of EEVB is not properly inserted |
| 22 | E5 | Evaporator coil temperature sensor fault for system A (T2-A) | T2-A sensor is short or open |
| 23 | E6 | Evaporator coil temperature sensor fault for system B (T2-B) | T2-B sensor is short or open |
| 24 | E7 | Discharge temperature sensor fault for system A (T5-A) | T5-A sensor is short or open |
| 25 | E8 | Discharge temperature sensor fault for system B (T5-B) | T5-B sensor is short or open |
| 26 | E9 | Indoor ambient temperature sensor fault(T1) | T1 sensor is short or open |
| 27 | EA | Outdoor ambient temperature sensor fault(T4) | T4 sensor is short or open |
| 28 | Eb | Thermostat output signal fault | Thermostat broken/Wiring error |
| 29 | Ec | No model information fault | Non model information/Incorrect setting of dial code |
| 30 | EF | External device protection/Remote off/E-STOP | External protection is triggered/E-STOP open |
| 31 | X.b5 | Refrigerant sensor fault | Abnormal refrigerant sensor |
| 32 | X.b4 | Refrigerant sensor communication fault | Wiring error/Incorrect DIP switch of the model/Wrong refrigerant sensor address |
| 33 | X.b7 | Refrigerant leak protection | Refrigerant leakage/Abnormal refrigerant sensor |
| 34 | X.b8 | Refrigerant sensor lifetime fault | Refrigerant sensor service life is exhausted/Abnormal refrigerant sensor |
Note:
| |||
| 35 | L1/0/n.10 | Hardware overcurrent protection | Motor, board, program does not match/Voltage drop/Wiring error/Board damage |
| 36 | L1/1/n.11 | Instantaneous phase current overcurrent protection | Motor, board, program does not match/Voltage drop/Wiring error/Board damage |
| 37 | L2/0/n.20 | IPM over-temperature protection | Poor heat dissipation/Abnormal temperature detection circuit |
| 38 | L3/0/n.30 | Low bus voltage fault | Wiring error/Abnormal voltage/Phase loss |
| 39 | L3/1/n.31 | High bus voltage fault | Wiring error/Abnormal voltage |
| 40 | L3/2/n.32 | Serious high bus voltage fault | Input overvoltage/Abnormal board |
| 41 | L3/4/n.34 | Power supply phase loss fault | Wiring error/Abnormal board/Abnormal power grid or distribution |
| 42 | L4/0/n.40 | EEPROM fault | EEPROM model mismatch |
| 43 | L4/3/n.43 | Abnormal current sampling bias | Abnormal current sampling circuit |
| 44 | L4/5/n.45 | Motor code mismatch | Incorrect DIP switch of the model/Incorrect board or program |
| 45 | L4/7/n.47 | Module type mismatch | Incorrect DIP switch of the model/Incorrect board or program |
| 46 | L5/0/n.50 | Fail to start | Fan locked/Upwind starting/Abnormal board |
| 47 | L5/2/n.52 | Locked-rotor protection | Fan locked/Abnormal board |
| 48 | L6/0/n.60 | Motor phase loss protection | The motor is not connected or in poor contact/Abnormal board |
| 49 | L6/5/n.65 | IPM short-circuit fault | IPM short-circuit |
| 50 | L66/n.66 | FCT detects faults | FCT test failed/Overcurrent during FCT detection |
| 51 | L7/1/n.71 | U-phase up-tube open | IPM damage |
| 52 | L7/2/n.72 | U-phase down tube open | IPM damage |
| 53 | L7/3/n.73 | V-phase up-tube open | IPM damage |
| 54 | L7/4/n.74 | V-phase down-tube open | IPM damage |
| 57 | E.SC | VFD system fault | VFD output short circuit/Motor winding short circuit/VFD main board damage |
| 58 | E.OC | VFD overcurrent fault | VFD output short circuit/Motor winding short circuit |
| 59 | E.OU | VFD overvoltage fault | VFD output short circuit/Surge voltage on the input side |
| 60 | E.LU | VFD undervoltage fault | Running interruption/Voltage fluctuation |
| 61 | E.OL | VFD overload fault | Overload/Input phase lack |
| 62 | E.IL | VFD input phase lack | Input phase lack/Voltage fluctuation/Unbalanced input voltage |
| 63 | E.OF | VFD output phase lack | Output phase lack/Motor failure |
| 64 | E.OH | VFD over-temperature protection | Hot environment/Overload/Heat dissipation fan fault |
| 65 | E.HA | VFD large zero drift fault | Short circuit of motor wire/Loose output terminal/VFD internal failure |
| 66 | E.SG | VFD ground short circuit fault | VFD internal failure/Motor failure |
| 67 | E.FS | VFD fan short circuit | VFD internal failure |
WARNING:
Information in this article is intended for use by individuals possessing adequate backgrounds of electrical and mechanical experience and who comply with all federal, state, and local laws, rules, orders, or regulations related to the installation, service, or repair of a heating or central air conditioning product. Any attempt to install, service, or repair a heating or central air conditioning product may result in personal injury and/or property damage. The manufacturer or seller cannot be responsible for the interpretation of the information contained herein, nor can it assume any liability in connection with its use.