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The fan limit control switch on a furnace regulates when the blower will come on or shut off. In many models it also has a built-in safety control for the burner to shut off at higher temperatures if the burner's inner control malfunctions. The switch is one of the easier devices and attachments on a furnace.
Read MoreThe function of your furnace limit switch is to tell the fan when to turn off and on depending on the temperature in the home. It’s possible to reset the switch at home when necessary by following a few simple steps.
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