Furnace Fan Temperature Sensor

The flame sensor occasionally becomes coated with residue and will prevent your furnace from lighting.

Furnace fan temperature sensor.

Honeywell st9103a1002 u replacement electronic fan timer for oil furnaces 60 90 120 150 sec. A control which turns the blower fan on or off depending on the air temperature within 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. Ami parts furnace flame sensor for goodman 0130f00010 fit b1172606 b11726 06 20488501 acs90453bxa p1257001f p1257007f acs90703bxa p1257002f p1257008f replacement 4 5 out of 5 stars 73 4 39 4.

A temperature sensor within the furnace. The mounting plate usually contains two or more terminals that receive control wires for the blower fan and the furnace s gas valve. Once you have cleaned the flame sensor make sure no wires from the igniter or flame can get in direct contact with the flame. A high limit setting which turns off the heat source or burner if the furnace overheats to dangerous temperatures.

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 typical limit switch consists of a long temperature sensor probe attached to a mounting plate. In the video you can see 4 burner ports. Honeywell l4064b2236 combination fan and limit furnace control.

Thermometrics manufactures thermocouples that meet furnace certifications as well as magnesium oxide mgo thermocouples that can be formed to fit almost any application. Be sure the filter is good. Conclusion gas furnace number 1 problem flame sensor. 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. The probe extends through the wall of the furnace housing and the plate fastens to the outside of the furnace. If the temperature inside the unit becomes to high the high limit switch will turn the gas off to the unit. The gas furnace should fire and you will have heat once again.

Remove it by pulling it down out of its bracket. A clogged up furnace filter will block air flow into a furnace and raise the temperature inside it. Lightly clean the surface with fine emery cloth and slip the sensor back into its bracket.