Set Appliance State:

Mains Power Off
Gas Off
Turn Hot Water Tap On
Boiler Switch in ON position
Central Heating switch in OFF (central) position
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Observation:

Observe sparking to main burner.
Note:Sparking will only last for approx. 5/10 seconds then appliance should go to lock out.
Switch OFF power and push reset button to cancel lockout.