Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Turn Hot Water Tap On
Attach pressure gauge to gas valve pressure outlet test point
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Observation:

During the sparking stage of the ignition sequence
does the U-gauge show a pressure of at least the
minimum burner pressure for the appliance? (see table)