Furnace High Limit Switch Location

The switch is generally located just past the heat exchanger.

Furnace high limit switch location.

Warning attempting to reset the furnace limit switch while the power is connected may result in electrical shock. A limit switch is a device that s located under your furnace s supply plenum. Open the access panel and locate the high limit switch. As a safety the high limit switch turns the gas off when the temperature becomes too high.

As a result your air handler needs to wait to turn on because otherwise it would be delivering cool or lukewarm air to your rooms. For example if the blower motor stopped running then no air would move through the unit. 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. Fan control limit switch.

From the mounting plate the switch is wired to the blower fan motor and to the gas valve. When your furnace begins a heating cycle it takes a little bit of time for your burners to heat up. Flip the circuit breaker switch back to the on position to restore power to the furnace. Function of the limit switch the limit switch plays an important role in every normal cycle of the furnace.

The high limit switch consists of a long temperature sensing probe attached to a metal mounting plate. Remove the cover by lifting it upwards or pulling it off to reveal the body of the switch and two metal arms. It should be somewhere on the hot box. 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.

Locate the white limit switch. High limit switch a high limit control switch will turn off the gas to a furnace if the temperature becomes too high. This is so that it can detect the temperature of the supply air. The flames would raise the temperature inside the unit and have no place to go getting hotter and hotter.

Disconnect the wires from the switch don t forget which goes where. The high limit switch is usually located below the sealed combustion chamber.