Furnace High Limit Switch Location

It should be somewhere on the hot box.

Furnace high limit switch location.

From the mounting plate the switch is wired to the blower fan motor and to the gas valve. 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. Disconnect the wires from the switch don t forget which goes where. Function of the limit switch the limit switch plays an important role in every normal cycle of the furnace.

The flames would raise the temperature inside the unit and have no place to go getting hotter and hotter. The high limit switch is usually located below the sealed combustion chamber. For example if the blower motor stopped running then no air would move through the unit. When your furnace begins a heating cycle it takes a little bit of time for your burners to heat up.

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. Locate the white limit switch. The high limit switch consists of a long temperature sensing probe attached to a metal mounting plate. As a safety the high limit switch turns the gas off when the temperature becomes too high.

Warning attempting to reset the furnace limit switch while the power is connected may result in electrical shock. Fan control limit switch. High limit switch a high limit control switch will turn off the gas to a furnace if the temperature becomes too high. The furnace pressure switch will always have flexible tubing running to it.

A limit switch is a device that s located under your furnace s supply plenum. Flip the circuit breaker switch back to the on position to restore power to the furnace. Depending on your furnace model the switch will be surrounded by a silver or white cover. Open the access panel and locate the high limit switch.

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. This is so that it can detect the temperature of the supply air.