Set Appliance State:

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

Observation:

Reset appliance if required (press reset button for 2 seconds and release).
Allow appliance to commence its ignition sequence.
Approximately 5 seconds after the fan has started, can sparking be observed at the spark electrodes through the observation window?
Note.
Appliance may enter lockout during this test, reset as required until test is complete.