Furnace Fan Limit Switch Location

I m not a tech and just some diy on how to trouble shoot a faulty limit switch.

Furnace fan limit switch location.

These questions and answers were posted originally at fan limit switch topic home so you may want to start reading there. The interior of a typical fan limit control switch found in the air handler of furnaces forced warm air heating systems discussed by ken martin s. The most common reasons for replacing the switch are. This video provides step by step instructions for replacing the safety limit switch on lennox furnaces.

Recently asked questions about furnace fan limit switch controls. For example if the blower motor stopped running then no air would move through the unit. Induction motor was running non s. A furnace has two switches called a fan limit switch and a high limit switch these switches can be separate or in one package called a combination switch.

High limit switch a high limit control switch will turn off the gas to a furnace if the temperature becomes too high. An adjustable fan limit controller typically is designed for furnaces operating at temperatures from 100 f to 250 f has a fan off lower limit that can be adjusted from 50 f to 200 f a fan on switch adjustable from 65 f to 215 f and a fan high limit stop set at 200 f. Or check out fan limit switch troubleshooting. Remove the cover by lifting it upwards or pulling it off to reveal the body of the switch and two metal arms.

It reads the temperature of the plenum and waits until it gets appropriately warm. Depending on your furnace model the switch will be surrounded by a silver or white cover. Locate the white limit switch. Came home to a cold house blowing cold air.

A limit switch is a device that s located under your furnace s supply plenum. If the temperature inside of the plenum gets too hot it shuts off the gas supply to your burners to prevent your. The flames would raise the.