Daikin NPE Tankless Water Heater Error Codes
NPE-480E.
Fuel: electric. 16 error codes documented.
Severity breakdown:
16 warning
Error Codes
| Code | Description | Severity |
| A1 | Indoor PCB Defective | Warning |
| A3 | Drain Level System Fault | Warning |
| A5 | Freeze-Up/Overheat Protection | Warning |
| A6 | Fan Motor Lock/Overcurrent | Warning |
| C4 | Heat Exchanger Thermistor Fault | Warning |
| C9 | Suction Air Thermistor Fault | Warning |
| E1 | Outdoor PCB Defective | Warning |
| E3 | High Pressure Switch Activated | Warning |
| E4 | Low Pressure Switch Activated | Warning |
| E5 | Compressor Motor Lock | Warning |
| E6 | Standard Compressor Motor | Warning |
| E7 | Outdoor Fan Motor Lock | Warning |
| F3 | Discharge Pipe Temp High | Warning |
| F6 | Refrigerant Overcharge | Warning |
| H6 | Position Sensor Fault | Warning |
| U4 | Communication Error Indoor/Outdoor | Warning |
Cross-Reference: Shared Codes with Other Daikin Models