First imagine the fire front surround is off, now, top left corner of fire, 9inches down and 7inches back you will find a flap of plastic to press to reset the Fanmaster.
It it's tripped the flap will only move a fraction to reset it. If it's a 1995 model though it's not got a switch but a 'one shot thermal fuse' which will need replacing.
The measurements are exact, but your going to be feeling for the flap, when you find it though next time will be simple