Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Turn Hot Water Tap On
Heating Switch OFF
Attach pressure gauge to burner pressure test point
Gas On
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Observation:

Allow burner to ignite and establish and measure
the burner pressure.
Does the burner pressure ramp up to a high
flame of (6.8mb +/- 0.6mb)?
Note:
When pressure gauge is removed the pressure test point should be tightened and checked for gas tightness.