Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Set Multimeter to Resistance Set meter to measure resistance
Disconnect fan connector ST5 from the pcb

Measurement:

Measure resistance across the disconnected fan connector ST5.
Note.
Black test probe to be connected to brown lead for all tests.
Expected resistances as below.
Test LeadsResistance in Mega Ohms
Brown - purpleGreater than 1 MOhms
Brown - OrangeGreater than 1 MOhms
Brown - YellowGreater than 1 MOhms
Brown - WhiteGreater than 1 MOhms