Furnace Fan Temperature Sensor

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Furnace fan temperature sensor.

A temperature sensor within the furnace. Remove it by pulling it down out of its bracket. 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.

A blower fan manual on switch is also included on many fan limit controls. 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. Once you have cleaned the flame sensor make sure no wires from the igniter or flame can get in direct contact with the flame. Be sure the filter is good.

Lightly clean the surface with fine emery cloth and slip the sensor back into its bracket. Conclusion gas furnace number 1 problem flame sensor. Things to check first. A control which turns the blower fan on or off depending on the air temperature within the furnace.

The flame sensor occasionally becomes coated with residue and will prevent your furnace from lighting. Thermometrics manufactures thermocouples that meet furnace certifications as well as magnesium oxide mgo thermocouples that can be formed to fit almost any application. The gas furnace should fire and you will have heat once again. A clogged up furnace filter will block air flow into a furnace and raise the temperature inside 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. A typical limit switch consists of a long temperature sensor probe attached to a mounting plate. Upon removing this screw the sensor will slide out so that you can easily clean it.

Once the flame sensor has been cleaned and reinstalled turn the power back on. The mounting plate usually contains two or more terminals that receive control wires for the blower fan and the furnace s gas valve. The probe extends through the wall of the furnace housing and the plate fastens to the outside of the furnace.