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 interface PCB (use insulation Mat as required)
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Measurement:

Reset appliance (press reset button for 2 seconds and release).
Measure for DC voltage across display connector
pins and a suitable earth connection.
Expected voltages as per table below;