Furnace Open High Temperature Limit Switch

Step 6 set the arm to left of the middle component to approximately 90 degrees fahrenheit.

Furnace open high temperature limit switch.

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. Limit switches turn off the burner and turn on the circulating fan if there is a high temperature condition in the furnace. 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. Setting the middle arm at this temperature ensures that the fan will switch on at the correct time when the furnace warms ups.

The limit switch includes a sensor in the heat exchanger to determine when the air is warm enough to circulate. A limit switch is a device that s located under your furnace s supply plenum. 4 4 out of 5 stars 70. Set the temperature on the middle component to approximately 105 to 115 degrees fahrenheit.

This video will help you to diagnose and replace a faulty limit control on your gas furnace. 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. Gas furnace hi limit switch testing using mulitmeter. Coleman 02535381000 furnace temperature limit switch genuine original equipment manufacturer oem part.

Once the air reaches a preset temperature the limit switch turns on the blower. It reads the temperature of the plenum and waits until it gets appropriately warm. 4 5 out of 5 stars 13.