Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Set Multimeter to Resistance Set meter to measure resistance
Remove left hand side panel
Remove electrical connections to fan assembly

Measurement:

Test 1. Measure for resistance across terminals 1 and 2 of fan assembly.
Expected resistance, see table below;
Test 2. Measure for resistance across terminals 1 and 3 of fan assembly.
Expected resistance greater than 1Mohm.