{"product_id":"oem-lennox-fan-and-limit-control-switch-38619","title":"OEM Lennox Fan and Limit Control Switch — 38619","description":"\u003cp\u003eThe genuine OEM Lennox \u003cstrong\u003e38619\u003c\/strong\u003e 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.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCommon failure symptoms:\u003c\/strong\u003e When the \u003cstrong\u003e38619\u003c\/strong\u003e 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.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy OEM matters:\u003c\/strong\u003e Lennox engineers calibrate this control to the specific temperature thresholds and airflow characteristics of their furnaces. An OEM \u003cstrong\u003e38619\u003c\/strong\u003e 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.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081116860787,"sku":"LNX-38619","price":19.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-limit-switch-snap-disc-LNX-38619.jpg?v=1783760736","url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-fan-and-limit-control-switch-38619","provider":"National HVAC Parts","version":"1.0","type":"link"}