Atwood Furnace Limit Switch Location

If the temperature of the combustion chamber exceeds the preset limit the switch will open and disrupt the flow of current to the circuit board in effect shutting down the main burner.

Atwood furnace limit switch location.

Figure out which model of furnace you have be sure you have the correct model number the parts are different for the different models. 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. Remove the face of the fan shroud then the blade assemblies and then the motor.

The larger assembly needs to be removed to access the motor so it can also be removed. The fan blade assembly on the combustion chamber side stays in it s cage. It will be located at the top of the panel. This is part 1 in a sears of videos for the operation diagnosis and repair of an atwood furnace.

The limit switch is a simple temperature controlled switch. I tried firing up my furnace in my rv it sounded good at first until it never ignited. Depending on your furnace model the switch will be surrounded by a silver or white cover. It s function is to monitor the combustion chamber heat level.

Remove the cover by lifting it upwards or pulling it off to reveal the body of the switch and two metal arms. The limit switch is behind the blower assembly. 9 times out of 10 it is the delay switch.