Set Appliance State:
Set Multimeter to DC Volts 
Turn Hot Water Tap On
Isolate Mains Power to appliance as per TOPs P4
Boiler on/off switch ON
Boiler on/off switch ON
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Measurement:
Reset lockout as necessary.
Allow ignition sequence to commence.
Measure the voltage across pin 1 (black) and pin 2 (blue)
on the 12 way connector on the front of the PCB.
Expected voltage should be greater than 150 Volts DC.
Allow ignition sequence to commence.
Measure the voltage across pin 1 (black) and pin 2 (blue)
on the 12 way connector on the front of the PCB.
Expected voltage should be greater than 150 Volts DC.
Isolate as per TOPs P4
and refit as necessary