OEM Lennox High Limit Switch — 26H65
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The genuine OEM Lennox 26H65 high limit switch is a thermally activated safety control that protects your furnace from overheating. Positioned to sense heat exchanger and plenum temperature, it interrupts power to the gas valve whenever the furnace exceeds its safe operating range, safeguarding the heat exchanger, blower assembly, and surrounding components.
Common failure symptoms: A worn or tripped 26H65 commonly causes no heat, frequent short-cycling, or the furnace shutting down shortly after ignition. Restricted airflow from a clogged filter, closed vents, or a weak blower motor can drive temperatures high enough to trip the limit repeatedly, and a switch that has failed open will keep the burners from firing until it is replaced.
Why OEM matters: The 26H65 is set to the specific trip temperature and mounting dimensions Lennox specifies for your furnace model. A generic switch with an incorrect temperature rating can permit unsafe overheating or trigger repeated nuisance faults. Choosing the factory OEM switch ensures precise overheat protection, a proper fit, and the safe, dependable performance Lennox built into your 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