OEM Lennox Limit Switch — 97J49
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The genuine OEM Lennox 97J49 limit switch is a critical safety control that monitors the temperature inside your furnace heat exchanger and plenum. When temperatures climb beyond a safe threshold—typically due to restricted airflow—this switch interrupts the burner circuit to prevent overheating, protecting both the heat exchanger and your home. It is engineered to the exact resistance and trip-point specifications required by your Lennox system.
Common signs of a failing limit switch include a furnace that short-cycles, blows only cold air, or shuts down unexpectedly on a call for heat. A switch that is stuck open will prevent the burners from firing entirely, while one that fails to open removes a vital layer of overheat protection.
Choosing an OEM Lennox 97J49 ensures the switch trips at the precise temperature your furnace was designed around. Generic substitutes often carry incorrect temperature ratings that cause nuisance trips or, worse, fail to protect the equipment. For reliable, code-compliant furnace operation, install the factory-specified part.
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