{"product_id":"oem-lennox-limit-switch-38m07","title":"OEM Lennox Limit Switch — 38M07","description":"\u003cp\u003eThe genuine OEM Lennox \u003cstrong\u003e38M07\u003c\/strong\u003e limit switch is the high-temperature safety control that protects your Lennox furnace from overheating. Mounted near the heat exchanger, it continuously monitors supply-air temperature and shuts off the burners if the furnace exceeds its safe operating limit, guarding against cracked heat exchangers and heat damage caused by restricted airflow.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCommon failure symptoms include:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eFurnace short cycles — burners light then quickly shut off\u003c\/li\u003e\n\u003cli\u003eLimit switch open fault codes on the control board\u003c\/li\u003e\n\u003cli\u003eNo heat even though the blower and igniter operate\u003c\/li\u003e\n\u003cli\u003eOverheating trips after a dirty filter or blocked airflow\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eBecause the \u003cstrong\u003e38M07\u003c\/strong\u003e is a life-safety device, the exact OEM part is essential. Aftermarket limits with the wrong trip temperature can nuisance-trip or fail to protect the heat exchanger. This factory replacement is calibrated to the precise open\/close temperatures Lennox specified, with the correct mounting and terminals, restoring proper overheat protection and reliable furnace cycling.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081107652979,"sku":"LNX-38M07","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-38M07.jpg?v=1783762537","url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-limit-switch-38m07","provider":"National HVAC Parts","version":"1.0","type":"link"}