OEM Lennox Fan and Limit Control Switch — 38619
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The genuine OEM Lennox 38619 fan and limit control is a dual-function safety and operational device for Lennox gas furnaces. It monitors plenum temperature to switch the blower fan on and off at the correct set points, while the limit portion acts as a critical high-temperature safety cutout — shutting off the burners if the heat exchanger overheats. This ensures efficient, safe furnace operation across the full heating cycle.
Common failure symptoms: When the 38619 fails or drifts out of calibration, you may experience a blower that runs constantly or never starts, short cycling of the burners, the furnace overheating and tripping on the limit, or no heat at all. A worn bimetal element or pitted contacts are typical culprits and warrant replacement.
Why OEM matters: Lennox engineers calibrate this control to the specific temperature thresholds and airflow characteristics of their furnaces. An OEM 38619 guarantees the correct fan-on/fan-off timing and limit trip point, protecting your heat exchanger and preserving rated efficiency. Generic substitutes risk nuisance trips, comfort problems, and voided warranties — making the factory part the reliable choice for your Lennox system.
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