Set Appliance State:

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

Observation:

Allow the boiler to ignite and run on central heating operation.
Is the heating operating satisfactorily?
Note.
It may take approximately 60 seconds for the boiler to fire for CH demand.
If the boiler ignites for central heating but the burner then extinguishes before the temperature of the system has increased, or if the burner ignites and established for brief periods only when running on CH please click here.