OEM Lennox Limit Switch — 11W52
OEM Guaranteed
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30-Day Returns
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The genuine OEM Lennox 11W52 limit switch is a critical safety control that monitors the temperature inside your furnace's heat exchanger compartment. When the air temperature climbs above a safe threshold, the switch opens the circuit to shut down the burners, protecting your Lennox furnace and heat exchanger from dangerous overheating. This factory-specified component is calibrated to the exact trip point your system requires for safe, efficient operation.
Common failure symptoms: A faulty 11W52 may cause the furnace to short-cycle (turning on and off repeatedly), fail to fire at all, or trip prematurely and leave you without heat. A limit switch that is stuck open will lock out the burners, while one stuck closed defeats the safety function entirely — a serious hazard.
Why OEM matters: Aftermarket limit switches often use incorrect trip temperatures or mounting geometry, which can lead to nuisance shutdowns or compromised safety. Installing the genuine Lennox 11W52 guarantees the correct calibration, fit, and reliability your Lennox equipment was engineered for, keeping your warranty and safety protections intact.
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