Has it got a reset switch then? can you feel the flap move at all or is it solid?
Early batches in 95 did not have the reset but a 'one shot' thermal fuse, this simply blows and need replacing but using a reset switch kit.
(unlike the guy in this month PC I might add that fixed his thermal fuse, cheap if you can do it but it's only going to blow again)
Anyway even with the thermal fuse, the outline of the flap is still there just not cut out so doesn't actually move.
If it has indeed got a reset then mains power is not getting to the Fanmaster, you will need to trace the circuit back to find out why
It should have an isolation switch that's fused at 10A or 13A, if it has a red light and it's lit the fuse is ok.