OEM Lennox Limit Switch — 49L87
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30-Day Returns
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The genuine OEM Lennox 49L87 limit switch is a critical high-temperature safety control designed for Lennox furnaces and heating systems. It continuously monitors the temperature inside the heat exchanger or plenum and shuts down the burners if temperatures exceed safe operating limits — preventing overheating, cracked heat exchangers, and potential fire hazards. This factory component is calibrated to the precise trip point your Lennox equipment requires for proper, safe operation.
Common failure symptoms: If the 49L87 fails, you may experience short cycling (the furnace repeatedly starting and stopping), the blower running continuously, no heat output, or the system locking out entirely. A worn or out-of-calibration limit switch can also trip prematurely on normal operating temperatures, leaving your home cold.
Why OEM matters: Lennox limit switches are calibrated to exact temperature thresholds matched to each furnace model. Installing a generic aftermarket switch risks incorrect trip points that either fail to protect the system or cause nuisance shutdowns. The OEM 49L87 guarantees correct fit, factory-rated calibration, and full compatibility — restoring safe, reliable heating performance to your Lennox unit.
Shipping Information
- Orders placed before 3PM CST ship same business day
- Standard delivery: 2-5 business days
- Express shipping available at checkout
- Free shipping on orders over $75
- Tracking number emailed upon shipment
Return Policy
- 30-day returns on unused parts in original packaging
- Electrical parts (capacitors, contactors, control boards) are final sale once installed
- Email info@nationalhvacparts.com to initiate a return
- Refunds processed within 5-7 business days