Name: Flame Sensor
Brand: Lennox
SKU: i2332567
Price: 23.02 USD
Availability: InStock

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LF24-30A-4

LF24-45A-4

Furnace not heating

Ensure proper ignition with this flame sensor, part number 20J91, made for select Lennox Furnace or Unit Heater.

The flame sensor monitors the burner to detect whether or not a flame is present. If the flame sensor is defective, it might fail to detect a flame. If the flame sensor does not detect a flame, the control board will shut off voltage to the gas valve to prevent the furnace from heating. Sometimes, if the flame sensor is dirty, it will fail to detect a flame. Try cleaning the flame sensor with a fine abrasive pad. If the furnace still doesn’t heat, replace the flame sensor.

Furnace is noisy or loud

The flame sensor monitors the burner to detect whether or not a flame is present. A defective sensor might fail to detect a flame, causing the control board to shut off voltage to the gas valve to prevent the release of gas. Sometimes, if the flame sensor is dirty and only intermittently sensing the flame is present, the control board will shut off the gas and try to relight the burner several times which can result in a lot of unusual noises.  Try cleaning the flame sensor with a fine abrasive pad. If the furnace still doesn’t light properly, replace the flame sensor.


Furnace starts then stops

Furnace burners won't stay lit

The flame sensor monitors the burner to detect whether or not a flame is present. If the flame sensor is defective, it might fail to detect a flame. If the flame sensor does not detect a flame, the control board will shut off voltage to the gas valve resulting in the burners not staying lit. Sometimes, if the flame sensor is dirty, it will fail to detect a flame. Try cleaning the flame sensor with a fine abrasive pad. If the burners still won't stay lit, replace the flame sensor.

Furnace takes too long to heat the home

The flame sensor monitors the burner to detect whether or not a flame is present. If the flame sensor is defective, it might fail to detect a flame. If the flame sensor does not detect a flame, the control board will shut off voltage to the gas valve resulting in the furnace taking too long to heat the home. Sometimes, if the flame sensor is dirty, it will fail to detect a flame. Try cleaning the flame sensor with a fine abrasive pad. If the burners still won't stay lit, replace the flame sensor.

Furnace is frequently cycling/short cycling

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Flame Sensor

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Flame-Sensor