Set Appliance State:
Set Multimeter to AC Voltage 
CH Demand
Use Insulation Mat as required
Isolate Mains Power to appliance as per TOPs P4
Mode Switch in LOW position
Gain access to PCB
Mode Switch in LOW position
Gain access to PCB
| 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.
Isolate as per TOPs P4
and refit as necessary