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Hi Rob, The board doesn't control the fan on your model unless you have the Fan Control (Fan50) board replacement. The sail switch doesn't do anything until the fan is at proper speed. Try taking the two blue wires (thermostat) loose where the wiring loom enters outside the furnace and hold them together and see if the furnace works ok. If so I'd look at a new thermostat or wiring problem in between. If not possibly the timer relay. Hard to tell without being there, but may get you going. Good luck |
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