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)
Place PCB in test position, click HERE for guidance
Ensure No demands are present
Place PCB in test position, click HERE for guidance
Ensure No demands are present
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Measurement:
Reset boiler as required.
Allow the boiler to commence self check mode.
Measure for A/C voltage across pins 5 & 6 of connector X3 on the PCB.
Expected voltage mains voltage (see note).
Note.
Voltage may only be present for approximately 20 seconds after boiler is reset, repeat test from set state as required,
Allow the boiler to commence self check mode.
Measure for A/C voltage across pins 5 & 6 of connector X3 on the PCB.
Expected voltage mains voltage (see note).
Note.
Voltage may only be present for approximately 20 seconds after boiler is reset, repeat test from set state as required,
Isolate as per TOPs P4
and refit as necessary