How to Clean a Flame Sensor

Installed as a safety feature in gas appliances with digital circuitry, flame sensors are designed to detect the presence of a pilot light. Over time, oxidation or carbon buildup on the sensor rod can interfere with the sensor’s ability to detect a heat, causing the circuit to shut off the gas supply. If an appliance fails to ignite, or is working intermittently, removing and cleaning the flame sensor often solves the problem.

Screwdriver
Wrench
Fine-steel wool

Instructions

- 1
  Turn off the appliance’s gas supply valve.
- 2
  Locate the flame sensor, adjacent to the pilot light. Remove the cover of the appliance with a screwdriver, if necessary, to access the sensor. Remove the mounting bracket at the base of the sensor with a wrench or screwdriver, depending on the design.
- 3
  Clean the sensor rod by gently rubbing the rod with a piece of fine-grade steel wool until all buildup is removed from the rod surface and the bare metal is visible.
- 4
  Reinstall the sensor. Turn on the gas supply and light the pilot. If the pilot will not stay lit, the sensor is faulty and requires replacement.

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