OEM Lennox Limit Switch — 83L90
OEM Guaranteed
Same-Day Ship
30-Day Returns
Secure Checkout
The genuine OEM Lennox 83L90 limit switch is a critical safety control in your Lennox furnace. It continuously monitors the temperature inside the heat exchanger compartment and automatically shuts off the burners if the unit overheats, protecting your furnace and your home from potential heat damage. This switch is engineered to the exact temperature threshold and mounting specifications required by your Lennox equipment.
Common failure symptoms: When the 83L90 fails or trips inconsistently, you may notice short cycling, a furnace that runs the blower but produces no heat, frequent lockouts, or a system that shuts down shortly after ignition. A worn or out-of-calibration limit switch is a leading cause of intermittent no-heat calls.
Why OEM matters: Lennox limit switches are calibrated to precise trip points that generic aftermarket parts rarely match. Installing an OEM 83L90 ensures the correct temperature setpoint, reliable safety response, and proper fit in the factory bracket — preserving both performance and warranty compliance for your Lennox system.
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