{"product_id":"oem-lennox-defrost-control-board-102151-01-47w47","title":"OEM Lennox Defrost Control Board 102151-01 — 47W47","description":"\u003cp\u003eThe genuine OEM Lennox \u003cstrong\u003e47W47\u003c\/strong\u003e (factory number 102151-01) is a defrost control board for Lennox heat pump systems. It monitors the defrost thermostat and its timing circuit to determine when the outdoor coil needs a defrost cycle, then energizes the reversing valve and outdoor fan relay to clear frost and restore efficient heating.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCommon failure symptoms:\u003c\/strong\u003e A failing \u003cstrong\u003e47W47\u003c\/strong\u003e often shows up as an outdoor unit that ices over and never defrosts, defrost cycles that never end, the fan running during defrost when it shouldn't, no heat-pump heating, or the auxiliary heat running constantly. Burnt relay contacts, tripped or blank status LEDs, and a scorched board are common visual signs.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy OEM matters:\u003c\/strong\u003e Lennox defrost boards use specific timing intervals and terminal logic tuned to their equipment. An aftermarket board with different jumper settings or relay ratings can mis-time defrost, cause reversing-valve chatter, or fail to protect the compressor. The factory \u003cstrong\u003e47W47\u003c\/strong\u003e ensures exact timing, correct terminals, and dependable defrost control for your Lennox system.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081131540851,"sku":"LNX-47W47","price":39.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-control-board-defrost-LNX-47W47.jpg?v=1783760043","url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-defrost-control-board-102151-01-47w47","provider":"National HVAC Parts","version":"1.0","type":"link"}