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)
CH temperature control set to MAX
Remove connector 54/11 from the PCB and make safe
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Measurement:

Measure the DC voltage between pin 3 where
connector 54/11 was fitted and a suitable earth.
Expect approximately 340 Vdc which should increase to approximately 355 Vdc during the sparking stage.
Ensure a good connection is made or misdiagnosis will occur.
Note.
The appliance will enter lockout after 3 attempts of ignition, approximately 40 seconds between each attempt, reset as required until test is complete.