Furnace Troubleshooting - Flame Sensor

If you have a furnace that is cycling off too quickly, or the burners are not staying on, you may have a flame sensor that needs cleaning.

Lightly sand the flame sensor with a soft abrasive pad, sand paper or emery cloth. Make sure to wipe off the sensor thoroughly before starting the furnace, you don’t want to leave a residue.

Turn off the furnace while cleaning the sensor.

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