Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Set Multimeter to DC Volts Set meter to measure DC Volts
Gain access to PCB (use Insulation Mat as required)
Ensure clock set to OFF
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Measurement:

Measure the voltage between the white wire marked 3 on X11 connector at the PCB and a suitable earth point.
Approx. 0V DC expected.
Note:
Remember if a white PCB is fitted X11
is in a different position.