| Fault Description | System Behaviour |
|---|---|
| No light | No power at control board |
| Light on | Appliance on but not operating during demand |
| Slow flash ( mostly off flashes on) | Ignition lockout |
| Slow flash ( mostly on flashes off) | Flue overheat or heat exchanger overheat |
| Fast flash | Volatile lockout sensor fan or code plug |
| 2 pulses | Check service mode switch is in minimum position |
| 5 pulses | Check service mode switch is in max position |





