OEM Lennox Limit Switch — Y8852
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The genuine OEM Lennox Y8852 limit switch is a temperature-activated safety control that protects your Lennox furnace from overheating. Mounted near the heat exchanger, it continuously monitors plenum temperature and opens the burner circuit if the furnace exceeds its safe operating range — preventing damage to the heat exchanger and reducing fire risk. It also helps sequence the blower during normal heating cycles.
Common failure symptoms: short cycling on high temperature, the furnace shutting down mid-cycle, burners that ignite but repeatedly cut out, or no heat because the limit has failed open. A limit switch that is stuck open, out of calibration, or fatigued from repeated overheating events will trip prematurely or fail to reset.
Why OEM matters: the Lennox Y8852 is built to the precise trip and reset temperatures your furnace was engineered around. Substitute switches with different setpoints can allow dangerous overheating or cause nuisance lockouts. Choosing the factory-specified part guarantees correct temperature response, proper fit, and full compatibility with your Lennox equipment.
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