Furnace High Limit Switch Location

Fan control limit switch.

Furnace high limit switch location.

The high limit switch consists of a long temperature sensing probe attached to a metal mounting plate. Open the access panel and locate the high limit switch. The location of the switch varies by the furnace model but it is typically located in the hot air supply plenum above the combustion chamber or heat exchanger of the furnace. The high limit switch is usually located below the sealed combustion chamber.

It should be somewhere on the hot box. A limit switch is a device that s located under your furnace s supply plenum. When your furnace begins a heating cycle it takes a little bit of time for your burners to heat up. From the mounting plate the switch is wired to the blower fan motor and to the gas valve.

Ordered new limit switch atwood 37022 hydro flame limit switch 190 degrees around 15 with shipping paying attention to get one with correct limit temperature and also trying to find out with rv manufacturer for no reason i decided to contact them not atwood whether it s possible to take sail switch out without taking the furnace unit out. For example if the blower motor stopped running then no air would move through the unit. Disconnect the wires from the switch don t forget which goes where. As a safety the high limit switch turns the gas off when the temperature becomes too high.

High limit switch a high limit control switch will turn off the gas to a furnace if the temperature becomes too high. Warning attempting to reset the furnace limit switch while the power is connected may result in electrical shock. It will be located at the top of the panel. Function of the limit switch the limit switch plays an important role in every normal cycle of the furnace.

Flip the circuit breaker switch back to the on position to restore power to the furnace. The furnace pressure switch will always have flexible tubing running to it. The flames would raise the temperature inside the unit and have no place to go getting hotter and hotter. Remove the cover by lifting it upwards or pulling it off to reveal the body of the switch and two metal arms.

Locate the white limit switch. This is so that it can detect the temperature of the supply air.