Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Set Multimeter to Resistance Set meter to measure resistance
Remove connector from diverter motor assembly

Measurement:

Test 1:
Measure the resistance between pins 1 and 2 on the diverter valve head.
Expect a resistance of 9.5Kohms or greater.
Test 2:
Measure the resistance between pins 2 and 3 on the diverter valve head.
Expect a resistance of 9.5Kohms or greater.
Are the resistances as expected?
Note:
The pins are numbered on the diverter valve casing.