{"product_id":"oem-lennox-limit-switch-w-manual-reset-93j39","title":"OEM Lennox Limit Switch w\/ Manual Reset — 93J39","description":"\u003cp\u003eThe genuine OEM Lennox \u003cstrong\u003e93J39\u003c\/strong\u003e limit switch with manual reset is a critical safety component that monitors temperature inside your furnace or air handler. If the heat exchanger area exceeds a safe threshold, this high-limit switch opens the circuit to shut down the burners and prevent overheating, protecting your equipment and home from damage.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCommon failure symptoms:\u003c\/strong\u003e A tripped or failed \u003cstrong\u003e93J39\u003c\/strong\u003e may cause the furnace to stop heating entirely, cycle on the limit repeatedly, or refuse to restart until manually reset. Because this is a manual-reset device, a persistent trip usually signals restricted airflow, a dirty filter, or a blower problem — but a switch that will not reset or has failed open must be replaced.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy OEM matters:\u003c\/strong\u003e The \u003cstrong\u003e93J39\u003c\/strong\u003e is calibrated to the specific trip and reset temperatures required by your Lennox system's design. Genuine OEM parts ensure the correct temperature rating, mounting, and terminal fit so the safety circuit performs exactly as engineered. Substituting a generic switch with the wrong set point risks nuisance shutdowns or, worse, failure to protect against a real overheat condition.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081091400051,"sku":"LNX-93J39","price":19.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-limit-switch-manual-reset-LNX-93J39.jpg?v=1783762444","url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-limit-switch-w-manual-reset-93j39","provider":"National HVAC Parts","version":"1.0","type":"link"}