Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Turn Hot Water Tap On
Dhw temperature control to maximum
Selector switch set to ch/dhw
Connect a U-gauge to the Burner Gas Pressure Test Point
Gas On
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Observation:

Allow the ignition sequence to commence.
During the sparking phase is there a burner pressure of at least MIN as per the table?
Note:
When pressure gauge is removed the pressure test point should be tightened and checked for gas tightness.