Set Appliance State:
Mains Power Off
Set Multimeter to AC Voltage 
CH Demand
Use Insulation Mat as required
Mode Switch in LOW position
| WARNING! Mains voltage is expected during test, follow TOPs P4 live testing procedure |
Measurement:
Measure the Voltage across the connection marked
6 (Orange wire) on connector PL5 and the connection
marked MAINS(N) (Blue wire) on the main connector block.
6 (Orange wire) on connector PL5 and the connection
marked MAINS(N) (Blue wire) on the main connector block.
Isolate as per TOPs P4
and refit as necessary