OEM Lennox Limit Switch — 56W24
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The genuine OEM Lennox 56W24 limit switch is a thermal safety device that protects your Lennox furnace from overheating. It senses the air temperature around the heat exchanger and cuts power to the gas burners the moment temperatures exceed the safe threshold, guarding against heat-exchanger damage caused by poor airflow or blower problems. The 56W24 comes calibrated to the exact trip point Lennox engineered for your unit.
Common failure symptoms: When the 56W24 fails, you'll often notice the furnace short cycling — starting and stopping in quick succession — or repeated high-limit lockouts that leave you without heat. A stuck-closed switch may allow overheating, while a switch that trips too early causes frustrating intermittent shutdowns during normal operation.
Why OEM matters: Limit switches are safety components, and their trip temperature must match your furnace precisely. Aftermarket substitutes with the wrong rating can compromise protection or trigger false faults. Installing the factory-specified 56W24 ensures the correct temperature calibration, terminal layout, and mounting for dependable, code-compliant Lennox furnace operation.
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