F7 and fault indicator LED are flashing – Although appliance switches off, flame still detected.

 Check Action
1.Electrode(s) dirty or defective?
- Switch OFF the appliance.
- Remove electrode assembly and bracket and check for wear, deposits and mechanical damage.
yes:- Replace electrode assembly.
- Switch ON the appliance.
- Press the reset button for 3 seconds and release it.
After releasing the appliance re-starts.

F7? go to 2
no:- Refit electrode assembly.
- Switch ON the appliance.
- Press the reset button for 3 seconds and release it.
After releasing the appliance re-starts. F7 go to 2
2.Problem with flue?
- Check CO2 level in combustion air
in the flue
(with outer casing fitted). Is CO2 level above 0.2%?
yes:There are flue gases in the combustion air.
- Check flue and repair or replace if necessary. F7? go to 3
no:go to 3
3.The PCB is damaged.Make a note of the altered service settings. B Switch OFF the appliance.
- Disconnect the boiler power connection.
- Change PCB control board.
- Reconnect the appliance power connection.
- Switch ON the appliance.
- Restore service settings previously noted down.

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