Description
Lennox 27J02 Flame Sensor Overview
The Lennox 27J02 Flame Sensor is an OEM-quality replacement component designed to maintain safe and reliable operation in Lennox gas furnace systems. The flame sensor plays a critical role in your furnace’s safety circuit — it detects the presence of a burner flame and signals the control board to keep the gas valve open. If no flame is detected, the control board shuts off the gas supply, preventing dangerous unburned gas accumulation.
Key Features
- Direct OEM replacement for compatible Lennox gas furnace models
- Ensures accurate flame detection for safe furnace operation
- Helps prevent nuisance lockouts caused by a failed or contaminated sensor
- Restores proper communication between the burner and furnace control board
- Built to meet Lennox quality and performance standards
- Easy installation for qualified HVAC technicians
Application
The 27J02 flame sensor is intended for use in Lennox gas furnaces as a direct replacement part. It is recommended to replace the flame sensor when experiencing symptoms such as furnace short-cycling, failure to stay lit after ignition, or fault codes related to flame sensing on the furnace control board.
Installation Notes
- Always disconnect power before servicing the furnace
- Clean the sensor rod with fine steel wool if contamination is suspected before replacement
- Verify compatibility with your specific Lennox furnace model before installation
- Installation should be performed by a licensed HVAC technician
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