carrier 58GP100-AA limit switch location


Old 10-11-13, 08:53 PM
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carrier 58GP100-AA limit switch location

Our furnace has apparently overheated, and a local technician suggested we reset the limit switch. I'm not the handiest guy around, but I cannot locate the limit switch or any type of reset button. We located a manual online that showed the location on the top of the furnace, but we have no such switch or button. Any ideas? Thanks in advance.
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Old 10-11-13, 09:27 PM
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Your limit switch should look like this photo. It is supposed to auto-reset after it cools down. This switch usually "trips" because of restricted air flow such as a dirty air filter, dirty evaporator coil, blocked return air, faulty blower motor and etc. 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. If the two wires are too short to connect you use a jumper wire like a paper clip to join the terminals. Tape it together and turn power back on to the furnace and set thermostat to heat. If the furnace works properly then you know the limit switch is the problem and needs to be replaced. Bypassing the limit switch is for testing purposes only and can't be used to operate the furnace. The limit switch is a safety device and must always be operating properly or you can put yourself at severe risk of fire.
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Old 10-11-13, 09:37 PM
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This diagram shows a vent safety shutoff switch with a manual reset.
If it tripped you would want to inspect the vent piping for a restriction.

Describe what your furnace is doing when no demand is present.
What does it do when given a heating demand?
Old 10-12-13, 01:32 PM
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<<Describe what your furnace is doing when no demand is present.
What does it do when given a heating demand?

Read more:>>>

The advice you got to reset a limit switch that resets itself automatically was poor.

Take the cover off the burner compartment of the furnace. Carefully observe and describe to us the sequence of events which occurs when you turn up the thermostat, and perhaps we'll be able to help you.
Old 10-12-13, 10:14 PM
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If you have a constant operating blower and no heat, and you have a counter-flo furnace you may have an open manual reset limit. Located in the blower compartment, but the reset is usually sticking out on the right top side.

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