OEM Lennox Limit Switch — 71J07
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The genuine OEM Lennox 71J07 high-limit switch is a temperature-sensing safety control that protects your furnace from overheating. Mounted near the heat exchanger, it monitors supply-air temperature and cuts power to the burners if it climbs too high — a common condition when airflow is restricted by a dirty filter, blocked ducts, or a failing blower motor.
Common failure symptoms: the furnace short cycles, the blower runs while the burners stay off, the unit produces no heat, or it repeatedly trips on a limit fault. A switch that opens prematurely or fails closed compromises the safety of the entire heating system.
Why OEM matters: the 71J07 is calibrated to the exact open and reset temperatures your Lennox furnace requires. A generic limit switch with a different trip point can allow dangerous overheating or cause needless shutdowns. Choosing the OEM part guarantees the correct setpoint, mounting fit, and terminal configuration — restoring safe, reliable overheat protection.
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