{"product_id":"oem-lennox-defrost-control-board-56m85","title":"OEM Lennox Defrost Control Board — 56M85","description":"\u003cp\u003eThe genuine OEM Lennox \u003cstrong\u003e56M85\u003c\/strong\u003e defrost control board manages the defrost cycle on your Lennox heat pump. In heating mode, frost and ice naturally build up on the outdoor coil. This board monitors coil temperature and elapsed run time, then reverses the system to melt accumulated ice and restore efficient heat transfer, energizing the reversing valve and auxiliary heat as needed.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCommon failure symptoms:\u003c\/strong\u003e When the \u003cstrong\u003e56M85\u003c\/strong\u003e defrost board fails, the outdoor unit may ice over completely, the heat pump can lose heating capacity, defrost cycles may run too often or not at all, or auxiliary heat may run excessively and spike energy bills. A blank display or failure to switch between heating and defrost modes also points to a faulty board.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy OEM matters:\u003c\/strong\u003e The defrost logic, temperature thresholds, and timing intervals on this board are engineered specifically for Lennox heat pump systems. Aftermarket boards may use different defrost strategies that reduce efficiency or leave the coil iced. The factory \u003cstrong\u003e56M85\u003c\/strong\u003e ensures proper terminal layout, direct fitment, and the precise defrost control your Lennox unit was designed around.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081102410099,"sku":"LNX-56M85","price":129.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-control-board-defrost-LNX-56M85.jpg?v=1783760058","url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-defrost-control-board-56m85","provider":"National HVAC Parts","version":"1.0","type":"link"}