OEM Lennox Limit Switch — 47L19
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The genuine OEM Lennox 47L19 limit switch is a high-temperature safety control used throughout Lennox furnaces and air handlers. It senses the air temperature in the heat exchanger and plenum, interrupting power to the burners if the unit exceeds its safe operating limit. This safeguard prevents heat exchanger damage and overheating conditions caused by poor airflow.
A failing 47L19 commonly causes the furnace to short-cycle, the burners to shut off shortly after ignition, no heat on a call from the thermostat, or a high-limit fault indication. Nuisance trips often point to a switch that opens too early, while a switch stuck open leaves the system unable to complete a heating cycle.
Choosing the OEM Lennox 47L19 is important because it is calibrated to the precise trip and reset temperatures your Lennox equipment requires, with the correct terminal and mounting configuration. Aftermarket switches with different ratings can cause improper cutoff or inadequate protection. Install the factory-engineered replacement to restore safe, consistent heating 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