OEM Lennox Limit Switch — 38M69
OEM Guaranteed
Same-Day Ship
30-Day Returns
Secure Checkout
The genuine OEM Lennox 38M69 limit switch is a temperature-sensing safety control mounted near the heat exchanger of your Lennox furnace. It monitors plenum and heat exchanger temperatures and opens the circuit to shut off the burners if the unit overheats — a condition usually caused by restricted airflow, a dirty filter, a failing blower motor, or a blocked duct. This prevents heat exchanger cracking and dangerous overheating.
Common failure symptoms: The furnace short-cycles on heat, the burners ignite and then shut off after a few minutes, you get no heat at all, or the blower runs continuously. A limit switch that fails open locks out heating, while one that fails closed removes essential overheat protection.
Why OEM matters: The Lennox 38M69 is calibrated to the exact open and close temperatures specified for your furnace model. A generic limit with the wrong temperature rating can allow unsafe overheating or trigger constant nuisance shutdowns. The factory part guarantees correct calibration, proper terminal fit, and reliable safe operation — protecting both your equipment and your home.
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