Set Appliance State:

Mains Power Off
Ensure appliance is cool (below 40°C)
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Observation:

Reset the appliance (turn selector switch to the reset position hold for 2 seconds then release)
Turn on the hot water tap and allow the boiler to commence its ignition sequence.
1.Does the boiler commence its ignition sequence ?
2.Once ignition sequence commences does the burner light and establish ?
Note:
If the burner does ignite and establish once confirmed turn the demand off.