Set Appliance State:

Mains Power Off
CH Demand
Selector switch set to ch/dhw
Flow and return valves fully open
CH thermostat set to max
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Observation:

CLICK HERE BEFORE CARRYING OUT THIS TEST
Allow the boiler to ignite and run in central heating mode.
Is the central heating operating satisfactorily?