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?
While the heating reaches temperature monitor the system pressure, to do this press the radiator button (top right) twice once the burner has lit to display the system pressure, to return the display to the temperature press the return      button once.
Note.
1. It may take approximately 60 seconds for the boiler to fire for CH demand.
2. It will be necessary to toggle between the system pressure and boiler temperature during the test.