Gas Furnace Limit Switch

The high temperature limit switch is an important device used in forced air furnaces powered by gas or heating oil.

Gas furnace limit switch.

Genuine oem part 0151f00000ps rc item 3320750. In the event that the furnace fan breaks down or malfunctions but the burner continues burning and increasing the temperature within the furnace the fan limit switch will cut the power to the gas valve. How should the thermostat wires be connected to my furnace. The gas fired forced air furnace fan limit switch in the photo below is pointed to by the red arrow.

The oil fired furnace fan limit switch shown in our photo below is in use on an oil fired warm air furnace where we can see about 3 4 of the silver colored dial where the fan limit switch settings are made red arrow. High limit switch a high limit control switch will turn off the gas to a furnace if the temperature becomes too high. It s also known as a fan limit switch or simply a limit switch. Additionally when the plenum gets too hot the high limit switch will shut off the gas supply to the furnace burners.

Locate the white limit switch. Goodman gas furnace limit switch opening blower only runs with a c. If the blower came on at the same time as the burner it would pump cold air through the house at first. What happens if your furnace limit switch stops working properly.

Genuine oem part. A limit switch also acts as a safety device for your furnace. Genuine oem part 20162903 rc item 2645576. Goodman furnace gas valve assembly.

It will be located at the top of the panel. Gas valve 2stage 24v 3 5 wc nat 1 2 goodman furnace gasket set. The switch makes sure the furnace is operating safely and at its desired settings. 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.

Trying to set my thermostat to use fan only for cooling. This is a safety feature that helps to prevent possible fires or explosions. The limit switch includes a sensor in the heat exchanger to. Remove the cover by lifting it upwards or pulling it off to reveal the body of the switch and two metal arms.

Depending on your furnace model the switch will be surrounded by a silver or white cover. Over time your furnace s limit switch can develop problems. A c electric blower motor issue. 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.

Why is the furnace heating the house far past the thermostat setting. Goodman furnace limit switch.