Set Appliance State:

Mains Power Off
CH Demand
CH temperature control to max
Ensure boiler is cool
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Observation:

Reset appliance, press and hold the reset button until the chimney
sweep button led flashes rapidly, then release the reset button.
Does the boiler reset?
Note:
1. If after boiler reset the fault code changes from the original to a different fault/status code, then select
Fault code CLICK HERE
Status code CLICK HERE
2. If the status code is a recurring issue, then choose boiler resets to carry out further tests.