Set Appliance State:

Turn Hot Water Tap On
Gas On
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Observation:

If required, reset boiler, press mode and ok for 2 seconds.
Allow self-check to complete and ignition sequence to commence.
Can the burner be heard to ignite & establish (see note1)?
Note.
1. A flame symbol will be displayed when the burner has established.
2. The boiler will enter lockout after 3 attempts of ignition, approximately 30 seconds between each attempt, reset as required until test is complete.