Furnace Fan Temperature Sensor

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Furnace fan temperature sensor.

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. Things to check first. 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.

A temperature sensor within the furnace. 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 typical limit switch consists of a long temperature sensor probe attached to a mounting plate.

A clogged up furnace filter will block air flow into a furnace and raise the temperature inside it. 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 blower fan manual on switch is also included on many fan limit controls.

In the heat treating industry temperature sensors must be able to handle exposure to extreme temperatures and conditions. 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. 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 control which turns the blower fan on or off depending on the air temperature within the furnace. Once the flame sensor has been cleaned and reinstalled turn the power back on. Lightly clean the surface with fine emery cloth and slip the sensor back into its bracket. A high limit setting which turns off the heat source or burner if the furnace overheats to dangerous temperatures.

Be sure the filter is good. Upon removing this screw the sensor will slide out so that you can easily clean it. Honeywell l4064b2236 combination fan and limit furnace control.