How to Clean the Flame Sensor on a Lennox Pulse 21 Model G21Q3-60-1 Furnace

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The Lennox Pulse 21 furnace has a flame sensor that will not allow the furnace to run if it is covered in debris. If the sensor is dirty, the heat will not go on. You can remove the flame sensor and clean it so that the Lennox furnace runs as it should. Cleaning the flame sensor takes only a few minutes.

Things You'll Need

  • Phillips screwdriver
  • Steel wool or 400-grain sandpaper
  • Lint-free cloth
  • Turn the gas valve to the “Off” position, and then switch the breaker for your Lennox furnace to the “Off” position. Make sure the furnace is cool before you continue.

  • Remove the two screws that hold the flame sensor in place, using a Phillips screwdriver.

  • Disconnect the wire that runs to the flame sensor by pulling it off the base. Remove the flame sensor

  • Wipe the surface of the flame sensor with steel wool or 400-grain sandpaper until you remove all of the buildup.

  • Wipe off the sensor with a lint-free cloth.

  • Reinstall the flame sensor by screwing it back into place and sliding the wire onto the base of the sensor.

  • Turn your Lennox furnace back on.

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