Furnace Fan Temperature Sensor

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.

Furnace fan temperature sensor. In the video you can see 4 burner ports. A temperature sensor within the furnace. Once you have cleaned the flame sensor make sure no wires from the igniter or flame can get in direct contact with the flame. In the heat treating industry temperature sensors must be able to handle exposure to extreme temperatures and conditions.

Upon removing this screw the sensor will slide out so that you can easily clean it. A blower fan manual on switch is also included on many fan limit controls. Once the flame sensor has been cleaned and reinstalled turn the power back on. Things to check first.

Honeywell l4064b2236 combination fan and limit furnace control. Lightly clean the surface with fine emery cloth and slip the sensor back into its bracket. Be sure the filter is good. Honeywell st9103a1002 u replacement electronic fan timer for oil furnaces 60 90 120 150 sec.

A high limit setting which turns off the heat source or burner if the furnace overheats to dangerous temperatures. The flame sensor occasionally becomes coated with residue and will prevent your furnace from lighting. A clogged up furnace filter will block air flow into a furnace and raise the temperature inside it. A control which turns the blower fan on or off depending on the air temperature within the furnace.

Conclusion gas furnace number 1 problem flame sensor. The probe extends through the wall of the furnace housing and the plate fastens to the outside of the furnace. A typical limit switch consists of a long temperature sensor probe attached to a mounting plate. 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.

The gas furnace should fire and you will have heat once again. If the temperature inside the unit becomes to high the high limit switch will turn the gas off to the unit. The mounting plate usually contains two or more terminals that receive control wires for the blower fan and the furnace s gas valve.