Gas Furnace Limit Switch Replacement

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.

Gas furnace limit switch replacement.

In a forced air heating system the blower motor fan in a gas or oil fired furnace turns on in response to the setting of the fan limit switch. If the temperature inside of the plenum gets too hot it shuts off the gas supply to your burners to prevent your furnace and heat exchanger from overheating. A new gas furnace installation or replacement cost ranges from 2 150 to 5 900 with most homeowners paying around 3 100. 4 1 out of 5 stars 17.

Over time your furnace s limit switch can develop problems. The limit switch energizes the fan circuit when warm air in the plenum of the furnace reaches a preset temperature. Remove the cover by lifting it upwards or pulling it off to reveal the body of the switch and two metal arms. Free shipping on your first order shipped by amazon.

If the blower came on at the same time as the burner it would pump cold air through the house at first. Get it as soon as sat sep 26. High limit switch a high limit control switch will turn off the gas to a furnace if the temperature becomes too high. The limit switch includes a sensor in the heat exchanger to.

Locate the white limit switch. More buying choices 3 10 5 new offers hh18ha211 bryant oem furnace limit switch l225 50 by oem replm for bryant. B13701 88 goodman oem furnace replacement limit switch l170 30. If you re willing to risk 120 and buy all three parts ahead of time you may be able to fix your own furnace in less than an hour and save a 125 service call.

When the desired temperature in the home is reached the furnace burner shuts off but. It turns out that most of the problems are caused by a clogged furnace filter or any of three easy to fix parts the igniter the flame sensor and the furnace high limit switch. Learn more and get free estimates. A limit switch also acts as a safety device for your furnace.