Set Appliance State:

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

Measurement:

Appliance On/Off control set to On position.
Reset lockout as necessary.
Allow fan to run and burner to ignite.
Observe the burner, does the burner establish and sparking cease?