Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Set Multimeter to DC Volts Set meter to measure DC Volts
CH Demand
Gain access to PCB (use Insulation Mat as required)
WARNING! Mains voltage is expected during test, follow TOPs P4 live testing procedure
Mains Power On

Measurement:

Measure for a constant voltage across the red and black wires of the 4 way plug on the PCB.
Expect approx 200V - 230V DC.
Note:
Voltage will only be present during the sparking phase of the ignition sequence.