Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to Resistance 
Disconnect fan connector at fan
Measurement:
Test 1: Place black probe on terminal 4 of the fan assembly and measure the resistance to each of the other terminals as stated in the table below:
Resistances should conform approximately to the table below.
Test 2: Measure the resistance between each of the
fan terminals and a suitable earth.
Expect 1 Mohm or greater on each test.
Are the resistances as expected?
Resistances should conform approximately to the table below.
| Terminals | Resistance |
| 4 - 5 | 1 Mohm or greater |
| 4 - 3 | 1 Mohm or greater |
| 4 - 2 | 1 Mohm or greater |
| 4 - 1 | 1 Mohm or greater |
Test 2: Measure the resistance between each of the
fan terminals and a suitable earth.
Expect 1 Mohm or greater on each test.
Are the resistances as expected?
Isolate as per TOPs P4
and refit as necessary