Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Appliance drained and discharged
Remove connector 20 (Pump) from the PCB and make safe
Remove the diverter valve from the left side hydraulic block
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Observation:

Observe the diverter valve movement.
The diverter valve initially powers all the way in, it will then power fully out, protruding approximately 11mm as per the photo below.
Repeat test as required.