{"product_id":"oem-lennox-limit-switch-86h72","title":"OEM Lennox Limit Switch — 86H72","description":"\u003cp\u003eThe genuine OEM Lennox \u003cstrong\u003e86H72\u003c\/strong\u003e limit switch is a high-temperature safety control that monitors heat exchanger and plenum temperature in your Lennox furnace. When temperatures climb past a safe threshold — usually from restricted airflow — the switch opens and shuts off the burners to prevent overheating and heat exchanger damage. This precision-calibrated switch is a direct factory replacement engineered for your Lennox equipment.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCommon failure symptoms:\u003c\/strong\u003e A faulty \u003cstrong\u003e86H72\u003c\/strong\u003e can cause the furnace to short-cycle on the limit, shut down mid-cycle, fail to fire the burners, or throw a limit-open fault code. Nuisance tripping when airflow is actually fine, or a switch that fails closed and never trips, both point to a limit switch that has drifted out of calibration and needs replacement.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy OEM matters:\u003c\/strong\u003e Limit switches are set to the exact open and close temperatures required for your specific Lennox furnace model. The OEM \u003cstrong\u003e86H72\u003c\/strong\u003e guarantees the correct trip point and mounting fit, preserving the factory-designed safety margin. An aftermarket switch with the wrong temperature rating can allow dangerous overheating or cause endless nuisance shutdowns. Protect your furnace and family with a genuine Lennox part.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081093235059,"sku":"LNX-86H72","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-86H72.jpg?v=1783762626","url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-limit-switch-86h72","provider":"National HVAC Parts","version":"1.0","type":"link"}