Set Appliance State:

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

Observation:

If required, reset boiler.
Allow ignition sequence to commence.
Inlet pressure should remain above N.G. 20 mb, L.P.G. 37mb throughout the ignition sequence.
Note.
1.The boiler will enter lockout after 4 attempts of ignition, reset as required until test is complete.
2. When the test is complete the pressure test point should be tightened and checked for gas soundness.