Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4

Observation:

Check the Flame Sensor Electrode lead from the Full Sequence board to the electrode.
Check the flame sensor electrode gap, this should be between 3.5 and 4.5mm.
Note:
1. Ensure flame sensor lead (blue) is checked not ignition lead (white).
2. Check that the sensing lead from the electrode back to the board is continuous.