Furnace Fan Temperature Sensor

Once you have cleaned the flame sensor make sure no wires from the igniter or flame can get in direct contact with the flame.

Furnace fan temperature sensor.

Thermometrics manufactures thermocouples that meet furnace certifications as well as magnesium oxide mgo thermocouples that can be formed to fit almost any application. Between the 1st and 2nd burner ports from left to right you can see the wire leading to the flame sensor the sensor is easily accessible and typically mounted by one 1 4 hex head screw. A temperature sensor within the furnace. A high limit setting which turns off the heat source or burner if the furnace overheats to dangerous temperatures.

A blower fan manual on switch is also included on many fan limit controls. Things to check first. Be sure the filter is good. Conclusion gas furnace number 1 problem flame sensor.

The mounting plate usually contains two or more terminals that receive control wires for the blower fan and the furnace s gas valve. The flame sensor occasionally becomes coated with residue and will prevent your furnace from lighting. In the video you can see 4 burner ports. A control which turns the blower fan on or off depending on the air temperature within the furnace.

Upon removing this screw the sensor will slide out so that you can easily clean it. If the temperature inside the unit becomes to high the high limit switch will turn the gas off to the unit. Honeywell l4064b2236 combination fan and limit furnace control. The probe extends through the wall of the furnace housing and the plate fastens to the outside of the furnace.

903600 flame sensor rod with wiring harness replacement kit for nordyne intertherm furnace replaces for flame sensor part 632396 sensing rod replacement 4 7 out of 5 stars 18 12 99 12. Remove it by pulling it down out of its bracket. Once the flame sensor has been cleaned and reinstalled turn the power back on. A typical limit switch consists of a long temperature sensor probe attached to a mounting plate.

The gas furnace should fire and you will have heat once again. In the heat treating industry temperature sensors must be able to handle exposure to extreme temperatures and conditions. A clogged up furnace filter will block air flow into a furnace and raise the temperature inside it.