| Error Code | Description |
| 21 | DC peak (IPM fault). Restart 10 times per hour, then lock. Compressor failure or excessive refrigerant in compressor. |
| 22 | CT 2 (Maximum CT). Restart after the issue is resolved. Inverter current > 14 A. |
| 23 | DC link voltage too high or low. Restart after the issue is resolved. DC voltage: 1~ < 140 VDC or > 480 VDC (3kW: 420 VDC); 3~ < 320 VDC or > 780 VDC. |
| 26 | DC compressor positioning problem. Restart 10 times per hour, then lock. Incorrect compressor connections (UVW). |
| 27 | PSC failure. Restart 10 times per hour, then lock. High current IGBT (check reactor). |
| 29 | High current in compressor phases. Restart 10 times per hour, then lock. |
| 32 | Discharge pipe temperature too high. Restart after the issue is resolved. Hot gas temperature TH5 > 105 °C (check refrigerant charge). |
| 35 | Low-pressure error. Restart 3 times per hour, then lock. Low pressure < 0 kPa (–49.5 °C). |
| 41 | Discharge pipe temperature sensor issue. Direct shutdown. TH5 sensor broken (200k ohms > 25 °C). |
| 43 | High-pressure sensor (open/short). Direct shutdown. LP/HP sensor broken. |
| 44 | Ambient temperature sensor issue. Direct shutdown. TH7 sensor broken (10k ohms > 25 °C). |
| 45 | Mid-condensation pipe temperature sensor issue. Direct shutdown. TH8 sensor broken (5k ohms > 25 °C). |
| 46 | Suction pipe temperature sensor issue. Direct shutdown. TH4 sensor broken (5k ohms > 25 °C). |
| 48 | Condenser outlet pipe temperature sensor issue (open/short). Direct shutdown. TH6 sensor broken (5k ohms > 25 °C). |
| 52 | Poor communication between inverter PCB and main PCB. Restart 3 times per hour, then lock. Wiring between main PCB and inverter PCB damaged (three-phase only). |
| 53 | Poor communication between CAN-PCB and Main-PCB. Direct shutdown. Wiring between main PCB and CAN-PCB damaged. |
| 54 | Incorrect phase sequence. Restart 10 times per hour, then lock. Only 2 phases or incorrect rotation field (three-phase only). |
| 55 | CAN communication error (CAN-PCB <=> Installation board). Direct shutdown. Wiring between CAN-PCB and indoor unit damaged. |
| 60 | EEPROM checksum mismatch. Direct shutdown. Replace EEPROM. |
| 61 | Condenser pipe temperature too high. Restart after the issue is resolved. Condensation temperature > 65.3 °C (4199 kPa) {Heating}; Condensation temperature > 64.2 °C (4101 kPa) {Cooling}. |
| 62 | Heatsink temperature too high. Restart after the issue is resolved. Heatsink temperature > 85 °C. |
| 65 | Heatsink temperature sensor issue. Direct shutdown. Heatsink/PCB inverter sensor broken. |
| 67 | ODU BLDC fan lock. Restart 10 times per hour, then lock. Fan blocked. |
