Turn off the circuit breaker at the main electrical panel that supplies power to the furnace. Tag or otherwise mark the breaker to alert others that the power is to remain off.
Locate the furnace fan limit switch. The switch is mounted on the furnace air plenum and is easily recognized because of its wiring once the access panel has been removed. Two of the wires are low voltage and go to the limit switch, and two wires are line voltage and go to the fan switch.
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You May Also LikeFounded in 1982, Goodman Manufacturing is an American company that produces heating and air conditioning equipment for residential and commercial customers. Goodman.
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