Set Appliance State:

Set Multimeter to AC Volts Set meter to measure AC Volts
Remove detection electrode connection FA2
from the PCB & make safe
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Measurement:

Measure for A/C voltage between the detection electrode PCB terminal FA2 and a suitable earth.
Expected voltage 70 - 100 AC.