Furnace Fan Temperature Sensor

A blower fan manual on switch is also included on many fan limit controls.

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. A temperature sensor within the furnace. Once the flame sensor has been cleaned and reinstalled turn the power back on. In the heat treating industry temperature sensors must be able to handle exposure to extreme temperatures and conditions.

Lightly clean the surface with fine emery cloth and slip the sensor back into its bracket. 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.

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The gas furnace should fire and you will have heat once again. Remove it by pulling it down out of its bracket. The flame sensor occasionally becomes coated with residue and will prevent your furnace from lighting. Conclusion gas furnace number 1 problem flame 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. 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. The probe extends through the wall of the furnace housing and the plate fastens to the outside of the furnace.

A clogged up furnace filter will block air flow into a furnace and raise the temperature inside it. Be sure the filter is good. In the video you can see 4 burner ports.