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Replacing a Furnace Thermocouple or Electronic Flame Sensor

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Replacing an Electronic Flame Sensor
Replacing a Furnace Thermocouple or Electronic Flame Sensor

Electronic flame sensor


Flame Sensor Replacement
Replacement of a removable type flame sensor is a simple repair.
  • Shut off gas and power to the furnace.
  • Remove the furnace's access cover.
  • If the furnace has been running, wait 30 minutes or so until the flame sensor cools.
  • The sensor may integral to the gas ignition system or independent and fastened to the burner assembly with a screw.
  • If your sensor is removable, first disconnect the electrical wire leads to the sensor. Disconnect the other end of the leads at the control box.
  • Next, remove the flame sensor by loosening the fastening screw(s) with a nut-driver or wrench.
  • Replace the flame sensor and fasten with the fastening nut, tightening with a nut-driver or wrench.
  • Connect the electrical leads to the sensor other end of the electrical leads to the electronic control box.
  • Replace furnace access cover.

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