Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to Resistance 
Remove fuse F1 from main control board PCB 40
Measurement:
Measure resistance of the fuse.
FUSE F1 RESISTANCE PCB 40 (MAIN CONTROL BOARD)
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Isolate as per TOPs P4
and refit as necessary