Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Turn Hot Water Tap On
Attach U-gauge to burner pressure test point
DHW temperature set to MAX
Set flow rate to 13 litres a minute
Selector Switch in Hot Water Position
Gas On
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Measurement:

Allow ignition sequence to commence and boiler to ignite and establish.
Burner pressure should be approximately 14.6mb.
Monitor the U-gauge for at least 1 minute, burner pressure should not modulate down during the test.
Notes:
When "U" gauge is removed test point should be tightened
and checked for gas tightness.