Set Appliance State:
Gas Off
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to AC Voltage 
CH Demand
Attach pressure gauge to the inlet pressure test point
(gas valve may differ to one shown in the image)
(gas valve may differ to one shown in the image)
Gas On
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Measurement:
Allow boiler to begin ignition sequence.
Does the inlet pressure remain satisfactory throughout?
Note:
When pressure gauge is removed the pressure test
point should be tightened and checked for gas tightness.
Does the inlet pressure remain satisfactory throughout?
Note:
When pressure gauge is removed the pressure test
point should be tightened and checked for gas tightness.
Isolate as per TOPs P4
and refit as necessary