{"product_id":"oem-lennox-limit-switch-33j38","title":"OEM Lennox Limit Switch — 33J38","description":"\u003cp\u003eThe genuine OEM Lennox \u003cstrong\u003e33J38\u003c\/strong\u003e limit switch is a temperature-activated safety control found in Lennox heating equipment. It monitors the air temperature around the heat exchanger and interrupts power to the burner or elements the moment the furnace runs too hot, safeguarding the heat exchanger and preventing hazardous overheating. The \u003cstrong\u003e33J38\u003c\/strong\u003e is factory-calibrated to your Lennox unit's specific trip and reset points.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCommon failure symptoms\u003c\/strong\u003e include repeated short cycling, heat that starts and abruptly stops, continuous blower operation, no warm air on demand, or a control board reporting an open-limit condition. A degraded switch may trip too soon, disrupting comfort, or stay closed and defeat an essential safety function.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy OEM matters:\u003c\/strong\u003e because the \u003cstrong\u003e33J38\u003c\/strong\u003e is a life-safety component, exact calibration and fit are non-negotiable. The Lennox factory part guarantees the correct temperature rating, terminals, and mounting for your furnace, avoiding the nuisance shutdowns or protection gaps that come with universal replacements. Install the OEM switch to keep your Lennox system operating safely and within spec.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081108963699,"sku":"LNX-33J38","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-33J38.jpg?v=1783762513","url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-limit-switch-33j38","provider":"National HVAC Parts","version":"1.0","type":"link"}