Fan motor control switches are set for 130 degrees to start and stop the fan, yours is fused shut so the fan will not turn off, there will be 2 such units in your heater the other is the high limit gas cut off switch locate your fan switch usually has an egg shape with a screw or nut holding on each tab,,so 2 screws or nuts, mark the locations the wires connect to the switch, some have a 3 wire unit, bring the faulty switch to a local plumbing and heating outlet and simply match yours to any available unit in the temp range yours is set to or 130 degree limit, and also has the same wire count, should be around 15 bucks or so good luck
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