Lennox 44L48 Flame Sensor – 44L4801

OEM Part Number: 44L4801
Catalog Number: 44L48
Brand: Lennox Genuine OEM
Product Type: Flame Sensor
Sensor Diameter: 0.114"
Sensor Length: 2.205"
Wire Gauge: 18 AWG
Terminal: Dual 1/4" Quick Connect Terminals
Insulator: Glazed Steatite
Base Unit: Each

Common Symptoms of a Faulty Flame Sensor

A dirty or failing flame sensor is one of the most common furnace service calls during the heating season. Symptoms include:

• Furnace ignites but shuts off after 2–5 seconds.
• Burners light briefly and then go out.
• Furnace repeatedly attempts to ignite.
• Ignition lockout or flame failure fault codes.
• Intermittent heating.
• Furnace runs one cycle but fails on the next.
• No heat even though the inducer motor and hot surface ignitor are operating correctly.

Throughout Alberta, including Calgary, Edmonton, Red Deer, Lethbridge, Medicine Hat, Fort McMurray, Grande Prairie, Airdrie, Sherwood Park, and St. Albert, flame sensor problems are common during long stretches of cold weather when furnaces operate almost continuously.

Across Ontario, homeowners in Toronto, Mississauga, Brampton, Vaughan, Markham, Richmond Hill, Oakville, Burlington, Hamilton, Ottawa, Kingston, Cornwall, London, Kitchener, Oshawa, Whitby, Ajax, Pickering, Barrie, and Sudbury often experience flame sensor issues caused by normal oxidation and carbon buildup after years of furnace operation.