OEM Lennox Limit Switch — 10M64
OEM Guaranteed
Same-Day Ship
30-Day Returns
Secure Checkout
The genuine OEM Lennox 10M64 high-limit switch is a critical safety control that monitors the temperature inside your furnace's heat-exchanger compartment. If airflow is restricted and temperatures climb beyond a safe threshold, the switch opens and shuts off the gas valve to prevent overheating, protecting the heat exchanger and your home.
When this switch fails or trips repeatedly, you may notice the furnace short cycling, the burners igniting then quickly shutting off, no heat despite a call from the thermostat, or the blower running continuously. Dirty filters, blocked returns, or a failing blower motor often cause limit trips, but a switch that has drifted out of calibration or opened permanently must be replaced.
Choosing the OEM Lennox 10M64 ensures the exact temperature rating and trip point your furnace was engineered to use. A mismatched limit switch can allow dangerous overheating or cause nuisance shutdowns. The factory part restores proper safety operation, maintains warranty coverage, and keeps your Lennox furnace running reliably through the heating season.
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