Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to 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.
Note.
Black test probe to be connected to brown lead for all tests.
Expected resistances as below.
| Test Leads | Resistance in Mega ohms |
| Brown - Purple | Greater than 1 MOhms |
| Brown - Orange | Greater than 1 MOhms |
| Brown - Yellow | Greater than 1 MOhms |
| Brown - White | Greater than 1 MOhms |
Isolate as per TOPs P4
and refit as necessary