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Flame Sensor

What is a flame sensor?

A flame sensor is a stainless steel rod that is used to detect if a flame is present. It uses a process called flame rectification which sends a signal through the flame to determine if it is there. If the flame on your burner is not there it will shut off the gas supply and the furnace to protect from any gas leaks.

Where is it located?

The flame sensor is found in the burner assembly directly in front of the burner.

Maintenance Tips

  • Polish the flame sensor with fine sandpaper or steel wool every 3 months

    • Lifespan

    The lifespan of the flame sensor is 3 - 5 years.

    This site is a structured reference describing common residential system failures, typical repair ranges, and replacement thresholds based on typical service conditions.