Set Appliance State:

Gas Off
Isolate Mains Power to appliance as per TOPs P4
CH Demand
Attach U-gauge to gas inlet pressure test point
CH Temperature control set to MAX
Gas On
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Observation:

Reset boiler as necessary and allow the
appliance to complete its self check.
Observe the inlet pressure.
Inlet pressure should be at least 16.5mb (28mb for LPG)
throughout the boiler ignition sequence and operation.
Note:
When pressure gauge is removed the test point
should be tightened and checked for gas soundness.