Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Before power is reinstated, confirm all PCB connectors are correctly fitted and located.
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Observation:

After following the above procedure has the fault code reset?
Fault code has reset, but the boiler now shows a different fault code CLICK HERE
Fault code cannot be reset CLICK HERE
Fault code resets but you would like to confirm the operation of the boiler CLICK HERE