OEM Lennox Limit Switch — 83L86
OEM Guaranteed
Same-Day Ship
30-Day Returns
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The genuine OEM Lennox 83L86 limit switch safeguards your Lennox furnace by monitoring heat exchanger temperature and interrupting the burner circuit whenever the unit runs too hot. This automatic response protects against overheating from clogged filters, closed vents, or a failing blower, keeping your heating system operating within safe limits.
Common failure symptoms: When the 83L86 degrades, you may experience short cycling, a furnace that blows cold air, no-heat conditions, or intermittent shutdowns that clear and return. A limit switch that trips prematurely is a frequent cause of unreliable winter heating.
Why OEM matters: The 83L86 is set to a specific opening temperature and built to fit the factory mounting location in your Lennox furnace. Genuine OEM replacement ensures the correct calibration and secure fit that generic parts can't reliably deliver, protecting both system performance and warranty coverage.
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