Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to AC Volts 
Turn Hot Water Tap On
Remove combustion chamber
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Measurement:
Reset appliance as necessary.
Approximately 8 seconds after mains power is turned on, measure the voltage between the black and blue wires at the fan.
Mains voltage expected.
Approximately 8 seconds after mains power is turned on, measure the voltage between the black and blue wires at the fan.
Mains voltage expected.
Isolate as per TOPs P4
and refit as necessary