OEM Lennox Limit Switch — 75W15
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The genuine OEM Lennox 75W15 limit switch is a critical safety control that monitors the temperature inside your Lennox furnace heat exchanger. When temperatures climb above the safe threshold, the 75W15 interrupts the burner circuit to prevent overheating, then automatically resets once conditions return to normal. It ensures the blower and burners cycle correctly to protect the heat exchanger and your home.
Common symptoms of a failing limit switch include a furnace that short-cycles, shuts off before reaching the set temperature, trips on high limit repeatedly, or refuses to fire at all. A switch that sticks open leaves you with no heat, while one that sticks closed removes an important safety layer against overheating.
Installing an OEM Lennox limit switch matters because the 75W15 is calibrated to the exact trip and reset temperatures your specific furnace model requires. Generic replacements with the wrong temperature rating can nuisance-trip or, worse, fail to protect the heat exchanger. Match the factory-spec part for safe, reliable operation and correct furnace sequencing all season long.
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