Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to AC Volts 
CH Demand
Remove controls cover as necessary
User display control set to HW and CH
User display control set to HW and CH
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Measurement:
Measure the voltage between the black wire and the neutral at the incoming mains terminal strip.
Mains voltage expected.
Mains voltage expected.
Isolate as per TOPs P4
and refit as necessary