{"product_id":"oem-lennox-camstat-limit-control-3in-supco-l593ba-y8851","title":"OEM Lennox Camstat Limit Control 3in (Supco L593BA) — Y8851","description":"\u003cp\u003eThe Lennox \u003cstrong\u003eY8851\u003c\/strong\u003e is a genuine OEM Camstat limit control (Supco L593BA equivalent) with a 3-inch sensing element. It serves as the high-limit safety switch in your Lennox furnace, monitoring plenum temperature and cutting power to the burners if the heat exchanger area gets dangerously hot. This protects the heat exchanger from cracking and prevents unsafe overheating.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCommon failure symptoms:\u003c\/strong\u003e When the \u003cstrong\u003eY8851\u003c\/strong\u003e fails, the furnace may repeatedly trip on limit and lock out, shut down mid-cycle, fail to fire at all, or overheat because the safety no longer opens. A stuck-closed switch is especially dangerous, while a stuck-open switch leaves you with no heat.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy OEM matters:\u003c\/strong\u003e The trip temperature and 3-inch probe length are matched to your Lennox heat exchanger geometry. Installing the factory-spec \u003cstrong\u003eY8851\u003c\/strong\u003e ensures the limit opens at exactly the rated setpoint for proper safety protection and a correct mechanical fit. Generic limits with the wrong length or setpoint can nuisance-trip or fail to protect the furnace. Always use genuine OEM for critical safety components.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081078751603,"sku":"LNX-Y8851","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-Y8851.jpg?v=1783759639","url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-camstat-limit-control-3in-supco-l593ba-y8851","provider":"National HVAC Parts","version":"1.0","type":"link"}