Set Appliance State:

Mains Power Off
Ensure NO demands
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Observation:

Does the Power On LED illuminate?
Whenever the appliance is switched on it will carry out a self-check of
approx. 10-15 seconds. During this the pump and fan should be running.
If the self-check completes successfully the pump and fan will stop
after 10-15 seconds and boiler will enter standby.
If the boiler detects a fault the pump & fan will continue to run and the Safety Lockout LED will illuminate.