Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Set Multimeter to AC Volts Set meter to measure AC Volts
Gain access to PCB (use Insulation Mat as required)
Function selector in standby position
All CH controls calling
WARNING! Mains voltage is expected during test, follow TOPs P4 live testing procedure
Mains Power On

Measurement:

Switch function selector in the CH position.
Measure voltage across the black lead (neutral) and the red lead (live), on connector marked X12 on the PCB.
Expected voltage Mains voltage (230 VAC).
Switch the function selector back to stand by position.
Measure voltage across the black lead (neutral) and the and the white lead (live), on connector marked X12 on the PCB.
Expected voltage Mains voltage (230 VAC).