{"product_id":"oem-lennox-defrost-control-board-12j54","title":"OEM Lennox Defrost Control Board — 12J54","description":"\u003cp\u003eThe genuine OEM Lennox \u003cstrong\u003e12J54\u003c\/strong\u003e defrost control board is the electronic brain that manages defrost timing on your Lennox heat pump. It processes input from the coil temperature sensor and defrost timer, energizes the reversing valve and outdoor fan relays, and coordinates the transition between heating and defrost modes to keep the outdoor coil free of ice. Built to precise Lennox specifications, this board delivers accurate, dependable control.\u003c\/p\u003e\u003cp\u003eWhen this control board fails, you may see the outdoor unit icing over, the heat pump failing to defrost or getting stuck in defrost, no outdoor fan operation, intermittent heating, or a complete no-heat condition. Electrical faults on the board can also trip safeties and leave the system inoperable.\u003c\/p\u003e\u003cp\u003eUsing an OEM Lennox \u003cstrong\u003e12J54\u003c\/strong\u003e board is essential because aftermarket boards frequently differ in relay ratings, connector layout, and firmware logic, which can cause miswiring, faulty cycles, or damage to other components. This factory part guarantees correct pinout, proper timing, and reliable long-term performance for your Lennox equipment.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081131671923,"sku":"LNX-12J54","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-12J54.jpg?v=1783760050","url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-defrost-control-board-12j54","provider":"National HVAC Parts","version":"1.0","type":"link"}