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:
Cancel purge cycle & if required, reset boiler.
Allow ignition sequence to commence.
Measure the AC voltage between the brown and blue wires on connector CN2.
Expect mains voltage approximately 4 seconds after the fan has started.
Allow ignition sequence to commence.
Measure the AC voltage between the brown and blue wires on connector CN2.
Expect mains voltage approximately 4 seconds after the fan has started.
Isolate as per TOPs P4
and refit as necessary