Description
Lennox 18G89 Flame Sensor Overview
The Lennox 18G89 Flame Sensor is a genuine OEM-replacement component engineered to deliver precise and dependable flame detection in compatible Lennox furnace systems. Designed to meet the exact specifications of your Lennox equipment, this flame sensor helps ensure your furnace operates safely and efficiently by confirming the presence of a burner flame and signaling the control board accordingly.
Key Features
- OEM-quality replacement flame sensor for compatible Lennox furnace models
- Ensures accurate flame detection to prevent unsafe furnace operation
- Signals the furnace control board to confirm active combustion
- Direct drop-in replacement for fast, straightforward installation
- Helps restore proper furnace ignition sequencing and system reliability
- Manufactured to Lennox quality standards for long-lasting performance
How It Works
The flame sensor monitors the burner flame during furnace operation. When a flame is present, a small electrical current passes through the sensor rod and is detected by the control board, confirming safe combustion. If no flame is detected — or if the sensor becomes coated with oxidation — the control board will shut down the gas valve as a safety precaution. Replacing a faulty or degraded flame sensor restores proper furnace operation and prevents nuisance lockouts.
Application
- Designed for use in compatible Lennox residential furnace systems
- Ideal for HVAC technicians performing routine maintenance or troubleshooting ignition issues
- Suitable for replacement when furnace exhibits symptoms such as short cycling, failure to stay lit, or ignition lockout faults
Why Choose the Lennox 18G89
Using an OEM-matched flame sensor like the Lennox 18G89 ensures compatibility and consistent performance. Generic or mismatched sensors can lead to unreliable flame detection, nuisance shutdowns, or even unsafe operating conditions. Trust the Lennox 18G89 to keep your system running safely and at peak efficiency.
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