{"product_id":"oem-lennox-defrost-control-board-56m37","title":"OEM Lennox Defrost Control Board — 56M37","description":"\u003cp\u003eThe Lennox \u003cstrong\u003e56M37\u003c\/strong\u003e is a genuine OEM defrost control board that manages the defrost cycle on your Lennox heat pump. It monitors coil temperature and elapsed run time, then reverses the system to melt frost and ice from the outdoor coil so your heat pump can operate efficiently in cold weather. This board is manufactured to Lennox specifications for exact fit and dependable defrost timing.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCommon failure symptoms\u003c\/strong\u003e include heavy ice buildup on the outdoor unit, a heat pump stuck in defrost mode, no defrost cycle at all, reduced heating output, or the reversing valve and auxiliary heat not sequencing correctly. Erratic operation or a failure to switch between heating and defrost typically points to a faulty control board.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy OEM matters:\u003c\/strong\u003e Defrost timing and temperature thresholds are calibrated specifically for Lennox heat pumps. A generic board can defrost too often or not enough, wasting energy and stressing the compressor. The genuine \u003cstrong\u003e56M37\u003c\/strong\u003e restores proper defrost logic, protects your compressor, and maintains the efficiency and warranty coverage your Lennox system was designed to deliver.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081102541171,"sku":"LNX-56M37","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-56M37.jpg?v=1783760056","url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-defrost-control-board-56m37","provider":"National HVAC Parts","version":"1.0","type":"link"}