OEM Lennox Limit Switch — 56W26
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The genuine OEM Lennox 56W26 limit switch is a critical safety control that monitors temperature inside the heat exchanger compartment of your Lennox furnace. If airflow is restricted or temperatures climb beyond the safe threshold, the 56W26 opens the circuit and shuts down the burners to prevent damage to the heat exchanger and surrounding components. It is factory-calibrated to the exact trip point Lennox specifies for your model.
Common failure symptoms: A worn or failed limit switch often causes the furnace to short cycle — igniting and then shutting off repeatedly — or to run the blower continuously without heat. In some cases a bad switch trips prematurely on normal operation, or fails to open and allows the unit to overheat. Nuisance lockouts and no-heat conditions are frequent signs the 56W26 needs replacement.
Why OEM matters: Because this is a safety device, correct calibration is essential. Universal or mismatched limit switches may trip at the wrong temperature, leaving your furnace unprotected or prone to false shutdowns. The OEM 56W26 ensures the precise temperature rating, terminal configuration, and mounting your Lennox equipment requires for safe, reliable operation.
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