Warmflow Boiler Error Codes
| Fault Code | System Behaviour |
| E01 | No flame – flame has failed during startup. |
| E02 | Safety thermostat tripped (95°C) |
| E03 | Flue thermofuse tripped |
| H20 | Low system pressure |
| E05 | Heating sensor fault |
| E22 | Fan fault |
| E16 | Parameter programming request |
| E35 | Ionisation electrode fault |
| E42 | Fan printed circuit board (PCB) fault |
