Set Appliance State:

Mains Power Off
Gas On; Pilot On
Turn Hot Water Tap On
Boiler On/Off Switch ON
CH Switch OFF
DHW Switch in INSTANT position
WARNING! Mains voltage is expected during test, follow TOPs P4 live testing procedure
Mains Power On

Measurement:

With the DHW tap fully open does the burner ignite and operate at its maximum gas pressure of approximately 9.0mb?