Furnace High Limit Switch Reset

Heating ducts are typically located in a home s basement or utility closet.

Furnace high limit switch reset.

One common symptom of a failing or blocked heat exchanger is the roll out switch tripping. There is a difference between a limit switch and a rollout switch. However the typical temperature settings are as follows. Depending on your furnace model the.

Locate the white limit switch. How to reset the limit switch on a goodman furnace step 1. Flip the circuit breaker switch that corresponds to the goodman furnace to the off position to disrupt the. Locate your furnace s heating duct.

How to reset a furnace limit switch step 1. This is a very important safety feature because if the furnace overheats it can cause the heat exchanger to crack. Then turn on the power and let the furnace restart. The instructions differ depending on whether you have a combination switch or separate high and fan control limit switches as well as on the specific model you have.

Repair experts tell us that they often show up at a residence only to find that the unit isn t getting power because of a tripped breaker or a flipped switch. I believe high limit switches are normally closed and they should always fail open. Grasp the sides of the panel and lift. Remove the furnace access panel to get to the internal components.

These also should be tested with a multi meter for continuity. If the high limit switch is tripped by overheating several times in a row then the furnace will go into lockout mode where it will not turn back on at all until it s serviced and reset. Limit switches turn off the burner and turn on the circulating fan if there is a high temperature condition in the furnace. Another common type is the solid state high limit switch which is smaller a circular in design.

The limit switch shuts off the burner when the temperature exceeds a preset temperature. It is best to consult the manual for your furnace if you want to reset the limit switch. It will be located at the top of the panel. In this episode of repair and replace vance shows how to replace the high limit switch in a gas furnace.

Look at each. The blower will continue to run until either the system is reset or the limit switch closes. This happens because the flames are not being drawn into and throu. When the temperature reduces to normal the burner will come back on.

When the high limit switch trips the flame heating element will be shut off and the blower will continue to run to clear the heat. So check that first.