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:

Reset lockout as necessary.
Allow fan to run and ignition sequence to commence.
Can sparking be heard?
Notes:
1. After 5 attempts the boiler will go to lockout. To reset the boiler press the reset button.
2. If fan fault code appears during this test click HERE