Lennox P/N 44L48 – Genuine OEM Angled Flame Sensor

The Lennox 44L48 is a genuine OEM angled flame sensor that is a critical safety component in a variety of Lennox gas furnaces and unit heaters, including specific GCS16 and GCS20 models. It continuously monitors the presence of the burner flame in the combustion chamber. If the control system does not detect a consistent flame, this sensor signals an immediate shutdown of the gas supply, which prevents the accumulation of unburned gas and ensures the safe operation of the heating system.

Being a Genuine OEM part from Lennox is vital for reliable and safe operation. This sensor is constructed with durable, high-temperature-resistant materials, including a glazed L-5 steatite insulator and copper-plated plate, designed to withstand temperatures up to 2200°F inside the combustion chamber. This precision build ensures an exact fit and the correct micro-amp signal output required by Lennox safety circuits, preventing nuisance service calls that often occur with universal replacement parts.

Key Features and Function:

• Flame Detection: Accurately detects the presence of a burner flame in the combustion chamber.
• Safety: Prevents unsafe conditions, such as gas leakage, by ensuring the furnace only operates when a flame is present.
• Fast Response: Quickly detects flame loss, enabling the control system to take immediate corrective action.
• OEM Part: A genuine Lennox part engineered for compatibility and reliability within Lennox systems.
• Angled Design: Features an angled component for easier installation and maintenance in some systems.

Product Details and Key Specifications:

• Brand: Lennox (Genuine OEM)
• Catalog Number: 44L48
• Model/Part Number: 44L4801
• EAN / UPC: 66255120351
• Type: Flame Sensor
• Product Width: 3.005 IN
• Diameter: 0.114 IN (Probe Diameter)
• Gross Shipping Weight:  1.5 LB
• Additional Information(Dia x L): 0.114 x 2.205" Sensor Length

🛠️ HVAC Depot Pro Tip: Routine Maintenance is Key

The 44L48 flame sensor is a very common failure point due to carbon buildup over time. Technicians should make it standard practice to clean this component annually using fine steel wool or an emery cloth. A simple cleaning can often resolve intermittent heating issues (when the furnace lights and shuts off repeatedly), potentially preventing an unnecessary part replacement.

The 44L48 is a direct OEM replacement for the following part numbers:

• OEM Numbers: 44L48, 44L4801, T6-2108, PSE-L48, L48.

Extensive Model Compatibility List:

Note: Use 'CTRL+F' to search for your specific model:

• Lennox GCS16 Series:

  GCS16-024-50, GCS16-030-75, GCS16-036-90, GCS16-048-75, GCS16-048-120, GCS16-060-75, GCS16-060-120.

• Lennox GCS16R Series:

  GCS16R-036-90, GCS16R-048-75, GCS16R-048-100, GCS16R-060-75, GCS16R-060-120.

• Lennox GCS20 Series:

  GCS20-024-50, GCS20-030-75, GCS20-036-75, GCS20-036-90, GCS20-042-75, GCS20-042-120, GCS20-048-75, GCS20-048-120, GCS20-060-75, GCS20-060-120.

• Lennox GCS20R Series:

  GCS20R-024-50, GCS20R-030-75, GCS20R-036-75, GCS20R-036-90, GCS20R-042-75, GCS20R-042-120, GCS20R-048-75, GCS20R-048-120, GCS20R-060-75, GCS20R-060-120.