Atwood Furnace Limit Switch Location

Furnace is running but not firing up so either the delay switch is broken or the circuit board.

Atwood furnace limit switch location.

Locate the white limit switch. The fan blade assembly on the combustion chamber side stays in it s cage. This is part 1 in a sears of videos for the operation diagnosis and repair of an atwood furnace. It will be located at the top of the panel.

It s function is to monitor the combustion chamber heat level. 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. The limit switch is behind the blower assembly. 9 times out of 10 it is the delay switch.

Remove the face of the fan shroud then the blade assemblies and then the motor. Depending on your furnace model the switch will be surrounded by a silver or white cover. 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. So i did some research read manuals and narrowed it down to the sail.

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 a simple temperature controlled switch. The limit switch is not hard to find or replace.