Set Appliance State:

Gas Off
Isolate Mains Power to appliance as per TOPs P4
Attach U-gauge to inlet pressure test point
Gas On

Measurement:

Depress gas control knob on the gas valve.
Keep gas valve control knob depressed while observing U-gauge.
Does the U-gauge show a constant pressure of approximately 37 mbar while the gas control knob is depressed?
Note:
When pressure gauge is removed the pressure test point should be tightened and checked for gas tightness.