Set Appliance State:

Mains Power Off
Heating temperature selector to OFF
Hot water temperature selector to maximum
Ensure heatbank is not up to temperature (this can be achieved by running the DHW with the mains power to the appliance on and the pilot switched off)
Gas On; Pilot On
WARNING! Mains voltage is expected during test, follow TOPs P4 live testing procedure
Mains Power On

Observation:

Does the burner ignite to heat the heatbank?