Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to DC Volts 
Turn Hot Water Tap On
Gain access to PCB (use Insulation Mat as required)
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Measurement:
Reset appliance as necessary.
Allow burner to ignite and establish.
Measure the voltage between Pin 6 (brown) and Pin 7 (blue) on connector X6. Mains voltage will be present.
Turn Hot Water Tap OFF
(using DHW isolation valve if necessary)
Does the voltage remain after demand ends?
Allow burner to ignite and establish.
Measure the voltage between Pin 6 (brown) and Pin 7 (blue) on connector X6. Mains voltage will be present.
Turn Hot Water Tap OFF
(using DHW isolation valve if necessary)
Does the voltage remain after demand ends?
Isolate as per TOPs P4
and refit as necessary