Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Turn Hot Water Tap On
Attach pressure gauge to gas valve outlet pressure test point
Selector switch to DHW position
CH temperature selector to minimum
DHW Preheat selector to Off position
Both modureg wires connected
Gas On
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Measurement:

Allow fan to run and ignition sequence to commence.
Does the burner ignite and go to full pressure of approximately 12.2 mb?
Note: When pressure gauge is removed pressure test point should be tightened and checked for gas soundness.