Set Appliance State:

CH Demand
CH temperature control turned to MAX
Gas On
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Observation:

Reset appliance if required.
Allow ignition sequence to commence.
Does the burner ignite and establish correctly?
A flame symbol will be displayed when the burner has established.
Click HERE if a fault code other than F4 occurs.
Note.
The appliance will enter lockout after 3 failed attempts of ignition, approximately 40 seconds between each attempt, reset as required until test is complete.