Description
Lennox 90H83 Flame Sensor Overview
The Lennox 90H83 Flame Sensor is a genuine OEM replacement component engineered to deliver precise and dependable flame detection in compatible Lennox heating systems. Designed to exacting Lennox specifications, this sensor helps ensure your furnace operates safely and efficiently by confirming the presence of a burner flame during each ignition cycle. When the flame sensor fails or becomes coated with oxidation, the furnace may shut down prematurely or fail to ignite — making timely replacement critical for uninterrupted comfort and system safety.
Key Features
- Genuine Lennox OEM replacement flame sensor — SKU 90H83
- Engineered for accurate flame rectification signal detection
- Helps prevent nuisance lockouts caused by a weak or faulty sensor signal
- Designed for direct, drop-in replacement in compatible Lennox furnace models
- Supports safe furnace operation by verifying burner flame presence
- Durable construction for long-lasting, reliable performance
Application
The Lennox 90H83 Flame Sensor is intended for use in compatible Lennox gas furnaces as a direct OEM replacement. It is an essential component in the furnace ignition safety circuit, working in conjunction with the furnace control board to confirm flame establishment after ignition. Always verify compatibility with your specific Lennox furnace model before installation.
Why Replace Your Flame Sensor?
Over time, flame sensors accumulate a thin layer of oxidation on the sensing rod, which can reduce the microamp signal sent to the control board. A degraded signal may cause the furnace to cycle off shortly after ignition, resulting in repeated lockouts and no heat. Replacing the sensor with a genuine Lennox OEM part restores proper signal strength and reliable furnace operation.
Installation Note
Flame sensor replacement should be performed by a qualified HVAC technician. Always disconnect power to the unit before servicing. Refer to the furnace manufacturer’s service documentation for proper installation procedures and torque specifications.
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