OEM Lennox Limit Switch — 50F48
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The genuine OEM Lennox 50F48 limit switch is a temperature-sensing safety control that monitors heat inside your Lennox furnace. It signals the blower to run and, most importantly, shuts off the burners if the plenum temperature climbs too high, protecting the heat exchanger and surrounding components from dangerous overheating.
Common failure symptoms: A failing 50F48 can cause the furnace to short-cycle, shut down mid-cycle on a limit trip, or fail to fire at all. Nuisance lockouts, a switch that stays open after cooling, or repeated overheating faults are typical signs the limit switch has drifted out of spec or failed.
Why OEM matters: Limit switches are rated to open and close at precise temperature thresholds specific to your furnace model. An improperly rated aftermarket switch may trip too early, too late, or not at all — defeating a critical safety function. The OEM 50F48 delivers the exact temperature calibration and mounting your Lennox equipment was engineered to use, ensuring 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