Set Appliance State:

Gas Off
Isolate Mains Power to appliance as per TOPs P4
CH Demand
Attach a pressure gauge to the inlet pressure test point
Gas On
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Observation:

Reset the appliance as necessary.
Allow ignition sequence to commence.
Inlet pressure should remain above N.G. 19 mb, L.P.G. 35 mb throughout the ignition sequence.
Is the inlet pressure satisfactory?
Notes:
1. The boiler will enter lockout after one attempt at ignition, reset as required until test is complete.
2. When pressure gauge is removed the pressure test point should be tightened and checked for gas tightness.