The Jalopy JournalWhen the main controller fails, the provides two emergency protocols:
| Error Code | Description | Common Fix | |------------|-------------|-------------| | | IPM Module Overcurrent | Check compressor winding resistance, replace IPM board | | P4 | Compressor Discharge Temp > 115°C | Low refrigerant charge, expansion valve stuck closed | | E1 | High pressure protection | Condenser coil dirty, fan motor failure, overcharge | | Ed | Communication fault between ODU and IDU | Broken H1/H2 wiring, wrong addressing | | L5 | Outdoor fan motor stall | Replace fan motor or check DC bus voltage |
If you’d like, I can:
