Set Appliance State:

CH Demand
Click here for important information regarding CH operation
CH temperature control set to MAX
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Observation:

Allow the burner to ignite and boiler to run on central heating operation.
Monitor the system pressure.
Is the heating operating satisfactorily?
Note.
During CH operation the chimney sweep led will illuminate green and blink off momentarily every 7 - 9 seconds to show the boiler is operating normally.