Lennox 44L48 Flame Sensor

Ensure reliable ignition sequences and system safety with the Lennox 44L48 Flame Sensor. As a critical OEM replacement part, this sensor is engineered to provide precise flame rectification, detecting the presence of a burner flame and sending a microamp signal to the SureLight ignition control board. Failure to confirm this signal typically results in a furnace lockout or short-cycling, where the burners ignite but extinguish within seconds. Designed for high-heat durability, the Lennox 44L4801 features a high-grade terminal and a 3-inch total length with a 2 1/8-inch "L" style rod profile for optimal positioning in the burner's path. This genuine component is a direct fit for various Lennox GCS and GCS20R series units, as well as select Allied, Armstrong, and Ducane equipment. Replacing a soot-covered or cracked HVAC flame sensor restores efficient combustion and prevents the dangerous accumulation of unburned gas within the heat exchanger.

• Direct OEM Compatibility: Replaces Lennox part number 44L4801 and fits a wide range of Lennox, Armstrong, and Ducane furnaces without modification.
• Precision Flame Detection: Provides accurate microamp (µA) feedback to the control board to prevent nuisance service calls and short-cycling.
• Durable Construction: The ceramic insulator and metal sensing rod are built to withstand the demanding conditions of a gas-fired combustion chamber.
• Easy Installation: Features a standard mounting bracket and terminal for a fast swap-out during preventative furnace maintenance.

What are the symptoms of a failing Lennox 44L48 flame sensor?
The most common indicator is the furnace burners lighting for approximately 2 to 5 seconds and then shutting off. After several failed attempts, the control board will enter a hard lockout mode. You may also see a specific flash code on the diagnostic LED of the ignition board.

Can I clean the 44L48 sensor instead of replacing it?
While cleaning carbon deposits with a fine emery cloth can provide a temporary fix, cracks in the ceramic insulator or severe oxidation on the rod require a full replacement to ensure consistent signal strength and system safety.

What causes a flame sensor to fail prematurely?
Environmental factors like high humidity, dust, or chemicals (such as laundry detergent fumes) can accelerate oxidation and soot buildup on the flame sensing rod, leading to a loss of the rectification signal.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.