Set Appliance State:

Mains Power Off
CH Demand
Ensure heating flow and return valves are fully open
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Observation:

Allow the boiler to ignite and run in central heating mode.
Is the heating operating satisfactorily?
Note:
If boiler does not react to CH demand click HERE.