OEM Lennox Limit Switch — 71W44
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The genuine OEM Lennox 71W44 limit switch is a high-temperature safety control that monitors the heat exchanger and plenum temperature in your Lennox furnace. It signals the blower to run and, if the unit overheats due to restricted airflow or another fault, opens the circuit to shut down the burners and protect the equipment from damage.
Common symptoms of a failing limit switch include short-cycling on the heat call, the blower running continuously, no heat, or the furnace repeatedly locking out on a high-limit fault. A switch that trips too early points to airflow problems, while one that fails to open removes a critical layer of overheat protection.
Choosing the OEM Lennox 71W44 ensures the exact trip and reset temperatures, sensing length, and mounting configuration specified for your Lennox model. Aftermarket switches with different setpoints can cause nuisance shutdowns or leave the furnace unprotected. As a safety-critical part, it should always be replaced with the factory-matched component to restore correct, reliable 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