Furnace Flame Sensor Repair

  • Year Repaired: 2020 – Present
  • Symptoms: Furnace pilot light turning on but not heating
  • Cause: Oxidized flame sensor
  • Outcome: Sanded off oxide layer
  • Material Cost: $5
  • Time: 30 min


This is a very common problem with all furnaces and boilers. It was a very straightforward repair. There were a couple possible issues, but since the sensor was visibly dirty this was the first one I tested.

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