Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Set Multimeter to Resistance Set meter to measure resistance
Unclip and disconnect diverter valve
(diverter valve can be removed from appliance through gap between left hand manifold and the fan)

Measurement:

Test 1:
Measure the resistance between pins 1 and 2.
Acceptable resistance is either approx 8.5kOhms or O.L
(resistance is dependent on motor position).
Test 2:
Measure the resistance between pins 1 and 3.
Acceptable resistance is either approx 8.5kOhms or O.L
(resistance is dependent on motor position).
Note:
Diverter valve has numbers printed under pins.