{"product_id":"oem-lennox-c3-controller-board-10x87","title":"OEM Lennox C3 Controller Board — 10X87","description":"\u003cp\u003eThe genuine OEM Lennox \u003cstrong\u003e10X87\u003c\/strong\u003e (103976-01) is a C3 controller that serves as the electronic brain for its Lennox application, coordinating inputs from sensors and thermostats and driving the outputs that run the system. It manages operating sequences, safety logic, and onboard diagnostics to keep the equipment running efficiently and safely.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCommon failure symptoms:\u003c\/strong\u003e the system fails to start or respond to a call, intermittent or no communication with the thermostat or other boards, fault and error codes with no mechanical cause, blank or frozen diagnostics, and components that won't energize. Power surges, moisture, and heat are frequent causes of controller failure.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy OEM matters:\u003c\/strong\u003e Lennox systems rely on the specific firmware, connector layout, and control logic of the factory C3 board. The correct \u003cstrong\u003e10X87\u003c\/strong\u003e guarantees compatible communication, proper sequencing, and full diagnostic support — a substitute board can misfire outputs or fail to communicate on the Lennox network. Verify part 103976-01 matches your specific Lennox model and revision before installing.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081078849907,"sku":"LNX-10X87","price":39.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-control-board-furnace-LNX-10X87.jpg?v=1783759632","url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-c3-controller-board-10x87","provider":"National HVAC Parts","version":"1.0","type":"link"}