In carrier downflow furnace models the flame roll out switch is just above the gas burner.
Carrier furnace fan limit switch location.
It also determines if the furnace should be shut down in the case of overheating.
Things to check first.
One likely will not as it is an auto reset one.
A fan limit switch consists of the following components.
Locate the white limit switch.
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Be sure the filter is good.
To access the burner components in a downflow furnace you ll need to remove the bottom front panel.
If the temperature inside the unit becomes to high the high limit switch will turn the gas off to the unit.
The fan limit switch also has two other functions.
Just as it determines when the blower assembly should turn on it will also determine when it should turn off.
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There should be three of them two should have a reset button on them that you can press.
Locate the rollout limit switch on the burner assembly.
A clogged up furnace filter will block air flow into a furnace and raise the temperature inside it.
Depending on your furnace model the switch will be surrounded by a silver or white cover.
How a fan limit switch works.
Look for a rounded component with a raised red button in the center.
If the two wires are too short to connect you use a jumper wire like a paper clip to join the terminals.
Remove the cover by lifting it upwards or pulling it off to reveal the body of the switch and two metal arms.
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.
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It will be located at the top of the panel.
The limit switches are around the burner housing.
Step 4 press and hold the red reset button in the center of the rollout limit switch component.
Pull the panel up and toward you to free it.