Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to AC Volts 
Gain access to PCB (use Insulation Mat as required)
Ensure No demands
Ensure No demands
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Measurement:
Allow the boiler to complete its self-check.
Ensure boiler is not attempting to ignite.
Measure for A/C voltage across the unused terminal (spark generator) and a suitable earth connection.
Expected voltage approximately 131 Vac.
Note.
Ensure a good connection is made or misdiagnosis will occur.
Ensure boiler is not attempting to ignite.
Measure for A/C voltage across the unused terminal (spark generator) and a suitable earth connection.
Expected voltage approximately 131 Vac.
Note.
Ensure a good connection is made or misdiagnosis will occur.
Isolate as per TOPs P4
and refit as necessary