Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Set Multimeter to Resistance Set meter to measure resistance
Remove control box cover if necessary
Fuse F1 is the fuse with stripes of the two fuses at the front of the PCB
Remove fuse (500 mAmp) from PCB

Measurement:

Check resistance of the fuse.
Replace fuse after test.