{"product_id":"oem-lennox-defrost-control-board-23m22","title":"OEM Lennox Defrost Control Board — 23M22","description":"\u003cp\u003eThe genuine OEM Lennox \u003cstrong\u003e23M22\u003c\/strong\u003e defrost control board manages the defrost cycle on your Lennox heat pump. During cold weather, frost and ice accumulate on the outdoor coil and reduce efficiency. This board monitors time and coil temperature, then reverses the refrigerant flow to melt the ice and restore proper heating performance — a function essential to keeping your heat pump running efficiently through winter.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCommon failure symptoms:\u003c\/strong\u003e When the \u003cstrong\u003e23M22\u003c\/strong\u003e fails, you may notice a heavily iced-up outdoor unit, a heat pump that won't defrost or defrosts too frequently, weak or no heating, or the auxiliary\/emergency heat running constantly. Erratic reversing-valve operation and no response to the defrost sensor are also telltale signs of a failed board.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy OEM matters:\u003c\/strong\u003e Defrost logic is specific to each Lennox model's timing intervals, sensor thresholds, and relay outputs. A generic board can misread coil conditions, waste energy, or leave your unit iced over. The factory \u003cstrong\u003e23M22\u003c\/strong\u003e guarantees the correct defrost programming, connector layout, and terminal assignments for a true plug-and-play repair on your Lennox equipment.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081112306035,"sku":"LNX-23M22","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-23M22.jpg?v=1783760055","url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-defrost-control-board-23m22","provider":"National HVAC Parts","version":"1.0","type":"link"}