Set Appliance State:
Mains Power Off
| Isolate Mains Power to appliance as per TOP's P4 |
Set Multimeter to Resistance 
Remove control box cover
Remove fuse F1 from PCB
Remove fuse F1 from PCB
Measurement:
Remove the fuse from the PCB and measure its resistance.
Expect a short circuit.
Refit the fuse after testing.
Expect a short circuit.
Refit the fuse after testing.
Isolate as per TOPs P4
and refit as necessary