Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to DC Volts 
DHW Demand
Gain access to PCB (use Insulation Mat as required)
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Measurement:
Press reset to cancel purge cycle countdown.
Allow ignition sequence to commence.
Measure DC voltage across terminals 1 (Live) and 2 (Neutral) at connector X7 on the PCB.
Expected voltage approximately 15-20 Volts DC.
Allow ignition sequence to commence.
Measure DC voltage across terminals 1 (Live) and 2 (Neutral) at connector X7 on the PCB.
Expected voltage approximately 15-20 Volts DC.
Isolate as per TOPs P4
and refit as necessary