Question about Emerson Lennox Ducane Armstrong Furnace Blower Motor K55hxkpy-9740

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Heater heats but shuts off

The furnace will operate and heats but shuts off after awhile and wont heat until you play with the thermostate

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Try the fan in the ON position on the thermostat, do you mean the fire shuts off or the blower?





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Posted on Dec 14, 2013

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1 Answer

My furnace wont turn off


Well Linda, is it the heat portion will not shut off or just the fan in the furnace that continues to run?? If the heat won't shut off, it will get uncomfortably HOT in your house, if its just the fan.....well, its just the fan.

More than likely its just the fan and it is running continually due to a stuck set of contacts in the control board or in the fan control board, if so equipped. If it is a furnace that is older than 15 to 20 years, it could be a mechanical relay that controls the fan directly off another control in the furnace vestibule that senses heat in the heat exchanger. If its an electric furnace, the first stage heat sequencer could be stuck closed causing continual fan operation and possibly one heat element is also energized. There are also several additional issues that could be the cause.

At any rate, its time to contact a reputable service entity to correct your problem. Good luck, Linda.

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