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Carrier furnace fan limit switch location.
Carrier furnaces combine quality and performance in a durable attractive and compact cabinet.
Locate the rollout limit switch on the burner assembly.
Just as it determines when the blower assembly should turn on it will also determine when it should turn off.
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A clogged up furnace filter will block air flow into a furnace and raise the temperature inside it.
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There should be three of them two should have a reset button on them that you can press.
It will be located at the top of the panel.
One likely will not as it is an auto reset one.
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To access the burner components in a downflow furnace you ll need to remove the bottom front panel.
Remove the cover by lifting it upwards or pulling it off to reveal the body of the switch and two metal arms.
Locate the white limit switch.
It is usually located behind the inducer fan motor area to test it you can turn off power to furnace remove the wires from either side of the limit switch and connect the two wires you removed together.
The limit switches are around the burner housing.
Additional comfort enhancing functions on select models include ideal humidity system technology for relief from hot and sticky summer air and comfortfan technology which allows you to select furnace fan speeds from the infinity system control.
Look for a rounded component with a raised red button in the center.
Things to check first.
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Be sure the filter is good.
If the temperature inside the unit becomes to high the high limit switch will turn the gas off to the unit.
How a fan limit switch works.
Pull the panel up and toward you to free it.
The fan limit switch also has two other functions.
Depending on your furnace model the switch will be surrounded by a silver or white cover.
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If the two wires are too short to connect you use a jumper wire like a paper clip to join the terminals.
A fan limit switch consists of the following components.