Lennox 79J22 Flame Sensor – 79J2201

OEM Part Number: 79J2201
Catalog Number: 79J22
Brand: Lennox Genuine OEM
Product Type: Flame Sensor
Previous Part Number: 79J2201
Replacement Available: Yes (superseded by a newer Lennox part number)
Weight: 0.05 lb

Common Symptoms of a Faulty Flame Sensor

A failing or dirty flame sensor is one of the most common causes of furnace service calls. Common symptoms include:

• Furnace ignites but shuts off after a few seconds.
• Burners light and immediately go out.
• Furnace repeatedly attempts to ignite.
• Ignition lockout or flame failure error codes.
• No heat even though the inducer motor and hot surface ignitor are operating normally.
• Intermittent furnace operation.
• Furnace cycles several times before remaining lit.

During the winter months, homeowners throughout Alberta, including Calgary, Edmonton, Red Deer, Lethbridge, Medicine Hat, Fort McMurray, Grande Prairie, Airdrie, Sherwood Park, St. Albert, and Leduc, often experience flame sensor issues after months of continuous furnace operation.

Across Ontario, including Toronto, Mississauga, Brampton, Vaughan, Markham, Richmond Hill, Oakville, Burlington, Hamilton, Ottawa, Kingston, Cornwall, London, Kitchener, Oshawa, Whitby, Ajax, Pickering, Barrie, and Sudbury, flame sensor failures are a common reason furnaces begin short cycling or locking out during cold weather.