Lennox 28G80 Limit Switch

The Lennox 28G80 Limit Switch is a critical safety component designed for precise thermal regulation within residential and commercial HVAC systems. This genuine OEM replacement part is engineered to monitor heat exchanger temperatures, effectively preventing equipment damage by breaking the electrical circuit if internal temperatures exceed safety thresholds. As a 110-150F auto limit switch, it is calibrated to actuate at a 150°F cutout and automatically reset once the temperature drops to 110°F, ensuring continuous system protection without manual intervention.

For field technicians and contractors, the 28G80 provides a direct replacement for Lennox 626576R and is compatible with a wide range of equipment from Allied, Armstrong, Concord, and Ducane. Utilizing a Therm-O-Disc 60T series design, this SPST (Normally Closed) furnace high limit switch offers the durability required for high-cycle applications. Whether you are troubleshooting a Lennox furnace limit switch failure or performing routine maintenance, this component ensures the HVAC high limit control remains within manufacturer specifications for optimal airflow safety and burner performance.

Key Benefits

• Precise Thermal Calibration: Features a fixed 150°F open and 110°F close range to maintain strict safety parameters.
• OEM Compatibility: Serves as the factory-authorized direct replacement for 626576R and 28G8001.
• Automatic Reset Logic: Eliminates the need for manual resets, reducing nuisance service calls while maintaining system integrity.
• Broad Application: Fits various Lennox-brand families including Allied Air and Armstrong units.
• Industrial Build Quality: High-grade HVAC temperature limit switch construction designed for long-term cycling in high-heat environments.

Common Questions

Is the 28G80 compatible with my older furnace model?
Yes, this part is the designated OEM upgrade for several legacy part numbers, including the 626576R. We recommend verifying the temperature stamps on your existing disc or checking the service manual for your specific model string.

How do I know if my furnace limit switch is bad?
If your blower motor runs continuously while the burners fail to ignite, or if the system short-cycles frequently, the Lennox 28G80 may be stuck in the open position. Use a multi-meter to check for continuity across the terminals under normal ambient conditions.

Can I use this in place of a manual reset switch?
No. This is an auto-reset limit control. You should always replace a limit switch with one that has the same reset logic and temperature ratings to ensure the system operates as originally engineered.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.