Set Appliance State:

Mains Power Off
On/Off Switch OFF
Set Multimeter to AC Volts Set meter to measure AC Volts
CH Demand
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Measurement:

Measure the voltage between the top 2 pins (black wires) on connector CN5.
Approximately 24 volts AC should be present.