OEM Lennox Furnace Limit Switch — 10M65
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The genuine OEM Lennox 10M65 limit switch is a temperature-sensitive safety control mounted near the heat exchanger of your Lennox furnace. It continuously monitors plenum temperature and opens the circuit to shut down the burners if the furnace overheats — most often caused by restricted airflow — protecting the heat exchanger from damage and preventing unsafe operating conditions.
Common failure symptoms: A faulty or nuisance-tripping limit switch commonly causes the furnace to short-cycle, shut off before reaching setpoint, or fail to fire at all. In many cases the blower runs continuously even when there is no call for heat. These symptoms can also point to a dirty filter or blocked vents, so airflow should be verified when the switch is replaced.
Why OEM matters: The Lennox 10M65 is set to the precise open and close temperatures specified for your furnace model, with the correct mounting profile and terminal configuration. Because this is a critical safety limit, using the exact factory part ensures the furnace shuts down at the intended threshold and continues to protect the heat exchanger reliably.
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