Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to DC Volts 
CH Demand
Gain access to PCB (use Insulation Mat as required)
CH temperature control set to MAX
Remove connector 35 from the PCB and make safe
CH temperature control set to MAX
Remove connector 35 from the PCB and make safe
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Measurement:
Reset appliance if required.
Allow self-check to complete and ignition sequence to commence.
Measure for DC voltage across pins 1 and 3 where connector 35 was fitted.
Expected voltage approximately 330 Vdc.
Ensure a good connection is made or misdiagnosis will occur.
Note.
Voltage will only be present during the sparking phase of ignition (approximately 5 seconds), the boiler will enter lockout after 3 attempts of ignition, approximately 40 seconds between each attempt, reset as required until test is complete.
Allow self-check to complete and ignition sequence to commence.
Measure for DC voltage across pins 1 and 3 where connector 35 was fitted.
Expected voltage approximately 330 Vdc.
Ensure a good connection is made or misdiagnosis will occur.
Note.
Voltage will only be present during the sparking phase of ignition (approximately 5 seconds), the boiler will enter lockout after 3 attempts of ignition, approximately 40 seconds between each attempt, reset as required until test is complete.
Isolate as per TOPs P4
and refit as necessary