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 correctly?
Note:
This appliance incorporates a Siphon Fill program, this keeps the boiler running on minimum output for central heating for 15 minutes and is activated every time the boiler is turned off and then back on again or if the boilers central heating thermostat is turned to summer mode and then turned back up.
Turning the appliance off then on again starts the cycle from the beginning.
If the boiler does not exit Siphon fill program after the elapsed time and/or is intermittently coming back on then click here for Factory reset procedure