Furnace High Limit Switch Open

If the furnace failure code indicates an open limit or open high temperature switch or open rollout switch it is probable that the furnace has overheated.

Furnace high limit switch open.

4 4 out of 5 stars 70. For example if the blower motor stopped running then no air would move through the unit. The flames would raise the temperature inside the unit and have no place to go getting hotter and hotter. Free shipping on your first order shipped by amazon.

More buying choices 8 80 7 new offers. Depending on your furnace model the switch will be surrounded by a silver or white cover. Limit switches turn off the burner and turn on the circulating fan if there is a high temperature condition in the furnace. 1 16 of 368 results for furnace high limit switch b13701 55 goodman oem furnace replacement limit switch.

Locate the white limit switch. When the air in the plenum reaches the high limit setting on the limit switch the switch turns on and activates the blower fan circulating air through the heat exchanger on its way to the house while simultaneously pulling cool air from the house through the air returns and into the furnace. Remove the cover by lifting it upwards or pulling it off to reveal the body of the switch and two metal arms. High limit switch a high limit control switch will turn off the gas to a furnace if the temperature becomes too high.

As a safety the high limit switch turns the gas off when the temperature becomes too high.