FA checks
| Step | Check | If yes | If no / next |
|---|---|---|---|
| 1 | Condensate trap blocked? | Clean the trap and discharge, then reset. | Go to step 2. |
| 2 | Electrode assembly burnt out? | Replace electrodes and reset. | Go to step 3. |
| 3 | CO2 in combustion air above 0.2%? | Check and clean the flue, then reset. | Go to step 4. |
| 4 | Gas valve damaged? | Isolate gas and power, replace the valve, leak-test, reset. | Go to step 5. |
| 5 | 20-pin connector lead damaged? | Replace the harness, then reset. | Replace the PCB last, restoring service settings. |
Gas work stays with a Gas Safe registered engineer. These steps are guidance from the manufacturer sequence, not a substitute for the handbook.