Set Appliance State:

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 correctly?
Note.
1. If a fault code occurs during CH operation CLICK HERE.
2. If boiler has an outside temperature sensor installed, be aware that this may affect the CH operation.