Set Appliance State:

Mains Power Off
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Observation:

Reset boiler.
(Reset is confirmed by the display returning to show flow temperature of appliance)
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
Note.
1. To reset boiler, press and hold the reset button for one second.