Question about Heating & Cooling
Posted by Anonymous on
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Posted on Jan 02, 2017
Usually when the furnace blower motor runs all the time
The limit switch or rollout switch is usually open or bad.
The furnace board is seeing that one of those switches is open, so it brings the blower on to try to get the heat out of the combustion chamber area, so the switch will close. But if the switch is bad and won’t close, the furnace board will keep the blower running continuously.
Posted on Mar 12, 2010
There may be two or three limit switches. The main limit switch is found over the burner about 2 " above. It will look like two wires connecting to a small rectangle plate. The limit is actually inside the heat exchanger and often opens if the air filter has not been changed or cleaned. Also on the burner assembly, there may be one or two small round disc shaped switches about the diameter od a quarter. They will also have two wires connected to them and they probably are connected to all the limit switches if you follow the wires. Look closely at these switches for a small tab located between the wires connected to them. This tab is a reset. Push in on the tab to reset. You may actually feel or hear the switch resetting if it opened. Make sure all registers are open and good air flow through the furnace.
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Posted on Jan 25, 2011
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