OEM Lennox Limit Switch — 10W05
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The genuine OEM Lennox 10W05 limit switch is a high-temperature safety control that monitors the heat exchanger and plenum temperature inside your Lennox furnace. If the furnace overheats — often due to restricted airflow, a dirty filter, or a failing blower — this switch cuts power to the burners to prevent heat exchanger damage and a potential fire hazard. It is calibrated to the precise trip and reset temperatures specified for your Lennox equipment.
Common failure symptoms include a furnace that short cycles, burners that ignite then shut off after a few minutes, no heat despite the blower running, or repeated safety lockouts. A limit switch that has weakened or failed can trip prematurely or fail to open when it should, leaving your system unprotected.
Installing an OEM Lennox 10W05 matters because aftermarket limit switches frequently use incorrect temperature ratings that cause nuisance trips or, worse, fail to protect the heat exchanger. This factory-spec part ensures the exact temperature calibration, mounting fit, and electrical rating your Lennox furnace was designed around for safe, reliable heating.
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