Furnace Open High Temperature Limit Switch

A limit switch is a device that s located under your furnace s supply plenum.

Furnace open high temperature limit switch.

Coleman 02535381000 furnace temperature limit switch genuine original equipment manufacturer oem part. I have a 1994 lennox 80 mgf series furnace and there is a 4 ligh flashing which say high limit or rollout switch open what does this mean and where can i find the switch and how can it be fixed witho read more. The high temperature limit switch senses the temperature of a furnace and tells the blower fan to turn on and off at the appropriate times. It also can shut down the furnace burners it if gets too hot inside the furnace identifying a limit switch a typical limit switch consists of a long temperature sensor probe attached to a mounting plate.

The limit switch includes a sensor in the heat exchanger to determine when the air is warm enough to circulate. Limit switches turn off the burner and turn on the circulating fan if there is a high temperature condition in the furnace. Set the temperature on the middle component to approximately 105 to 115 degrees fahrenheit. Gas furnace hi limit switch testing using mulitmeter.

Once the plenum reaches a specific temperature the limit switch sends a signal to the air handler to begin running and delivering warm air to your home. 4 4 out of 5 stars 70. 1 16 of 368 results for furnace high limit switch b13701 55 goodman oem furnace replacement limit switch. It reads the temperature of the plenum and waits until it gets appropriately warm.

If the furnace failure code indicates an open limit or open high temperature switch or open rollout switch it is probable that the furnace has overheated. Setting the middle arm at this temperature ensures that the fan will switch on at the correct time when the furnace warms ups. This video will help you to diagnose and replace a faulty limit control on your gas furnace.