OEM Lennox Limit Switch — 27K16
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The genuine OEM Lennox 27K16 limit switch is a temperature-activated safety control that safeguards your Lennox furnace against overheating. Mounted on the heat exchanger or in the plenum, it senses supply-air temperature and cuts power to the burners the moment heat climbs above the safe threshold — a condition typically caused by a dirty filter, closed vents, or a struggling blower. It is a small but essential guardian of both your equipment and your home.
Common failure symptoms include a furnace that short-cycles on and off, intermittent or no heat, a blower that runs nonstop, or a control board reporting an open-limit fault. When this switch fails open or drifts out of calibration, it interrupts the heating sequence and prevents the burners from firing.
Why OEM matters: A limit switch is only effective when it trips at precisely the right temperature. Generic replacements often open too early, causing nuisance lockouts, or too late, defeating their protective purpose. The Lennox 27K16 is factory-calibrated to your furnace's exact specifications, ensuring dependable safety operation and a perfect fit within the Lennox control circuit.
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