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)
Remove white retaining clip, remove modulating
plug from the pump and make safe
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Measurement:

Measure the voltage between pin 7 (black wire) and
pin 9 (purple wire) on LV2.
Approx. 6V DC should be measured.
Note:
This test can be carried out during the appliance self check.