Description
The Lennox 79J22 is an OEM replacement flame sensor engineered to deliver accurate and dependable flame detection in Lennox heating systems. Designed as a direct factory replacement, this sensor helps ensure your furnace operates safely and efficiently by confirming the presence of a burner flame during each ignition cycle.
How It Works
The flame sensor monitors the burner flame by passing a small electrical current through the flame itself. If the control board does not detect the expected signal — indicating the flame has not been established or has gone out — it will shut down the gas valve to prevent unburned gas from accumulating. This critical safety function protects both equipment and occupants.
Key Features
- OEM Lennox replacement part — SKU 79J22
- Designed for direct, drop-in installation in compatible Lennox furnace models
- Provides reliable flame rectification signal to the furnace control board
- Helps prevent nuisance lockouts caused by a worn or contaminated sensor
- Supports safe ignition cycle operation and system longevity
- Quality construction for long service life in demanding heating environments
Installation & Maintenance
Over time, flame sensors can accumulate oxidation or residue on the sensing rod, causing weak or intermittent signals that result in furnace lockouts or short-cycling. Replacing the sensor with a genuine Lennox 79J22 restores proper operation and eliminates nuisance service calls. Always follow manufacturer guidelines and applicable safety codes when servicing gas-fired heating equipment.
Applications
- Compatible Lennox gas furnaces requiring OEM flame sensor replacement
- Residential and light commercial heating applications
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