Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to AC Volts 
Turn Hot Water Tap On
Gain access to PCB (use Insulation Mat as required)
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Measurement:
Reset appliance as necessary.
Allow the fan to run and ignition sequence to commence.
During the sparking stage of the ignition cycle measure the AC voltage between pins 22 and 23 at connector M7 on the PCB.
Expect mains voltage.
Is the voltage measured as expected?
Note:
Appliance may go to lockout during this test, reset as necessary to confirm result.
Allow the fan to run and ignition sequence to commence.
During the sparking stage of the ignition cycle measure the AC voltage between pins 22 and 23 at connector M7 on the PCB.
Expect mains voltage.
Is the voltage measured as expected?
Note:
Appliance may go to lockout during this test, reset as necessary to confirm result.
Isolate as per TOPs P4
and refit as necessary