Error Code Table for Under-Bench RV SystemsUpdated 2 days ago
This article provides an error code table for Under-Bench RV Inverter Packaged Heat Pump Air Conditioners.
| Code | Cause of Error |
| A1 | Indoor side EE malfunction |
| A2 | Evaporator fan motor malfunction |
| A4 | Evaporator sensor malfunction |
| A5 | Indoor ambient temperature sensor malfunction |
| A8 | Outdoor EE malfunction |
| B4 | Compressor starts abnormally (Lack of phase/reversal) |
| B5 | Compressor out-of-step failure |
| B6 | IPM module failure |
| B8 | Discharge air temperature sensor malfunction |
| C2 | Condenser temperature sensor malfunction |
| C3 | Outdoor ambient temperature sensor malfunction |
| C4 | Outdoor DC fan motor failure |
| C5 | Drive bus overvoltage protection |
| C6 | Drive bus for undervoltage protection |
| C7 | Drive phase current overcurrent fault |
| C8 | Abnormal phase current sampling |
| D1 | Outdoor unit has shut down for AC current protection |
| D2 | Compressor phase current protection shutdown |
| D3 | Outdoor side AC voltage high/low protection |
| D4 | DC bus voltage high/low protection |
| D5 | IPM high temperature protection shutdown |
| D6 | Discharge air temperature too high cause shutdown protection |
| D7 | Cooling evaporator anti-freezing protection shutdown |
| D8 | Condenser coil overheat shutdown protection in Cooling mode |
| E1 | Heating mode evaporator overheat protection shutdown |
| E2 | Protection shutdown against low outdoor ambient temperature in Cooling mode |
| E3 | Protection shutdown against high outdoor ambient temperature in Heating mode |
| E5 | 4-way valve reversing failure |
| E6 | Low refrigerant fault |
| Er | Communication failure between mainboard and thermostat |
| FL | Full water pan protection shutdown |