Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to AC Volts 
Gain access to PCB (use Insulation Mat as required)
Run hot water tap until water cool then turn tap OFF
DHW temperature selector to MAX
Run hot water tap until water cool then turn tap OFF
DHW temperature selector to MAX
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Measurement:
Reset appliance as necessary.
Allow the ignition sequence to commence and burner to ignite.
While measuring the voltage between the pins with the brown wire and blue wires at connector X14 on the PCB turn the DHW temperature control to MINIMUM to disable preheat.
Does the mains voltage disappear immediately or does the PCB continue to send voltage to the gas valve after the demand ends?
Allow the ignition sequence to commence and burner to ignite.
While measuring the voltage between the pins with the brown wire and blue wires at connector X14 on the PCB turn the DHW temperature control to MINIMUM to disable preheat.
Does the mains voltage disappear immediately or does the PCB continue to send voltage to the gas valve after the demand ends?
Isolate as per TOPs P4
and refit as necessary