Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Set Multimeter to DC Volts Set meter to measure DC Volts
Turn Hot Water Tap On
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Measurement:

Reset lockout as necessary.
Allow ignition sequence to commence and sparking heard.
Measure the DC voltage between pin 3 (black) and pin 5 (red) on the 6 pin connector.
Expect approximately 215V DC.
Is the voltage measured as expected?