{"product_id":"oem-lennox-defrost-control-board-r47181-001-46k67","title":"OEM Lennox Defrost Control Board R47181-001 — 46K67","description":"\u003cp\u003eThe genuine OEM Lennox \u003cstrong\u003e46K67\u003c\/strong\u003e (factory number R47181-001) is a defrost control board for Lennox heat pump systems. It coordinates the defrost thermostat input with an internal timer to decide when the outdoor coil requires defrosting, then switches the reversing valve and outdoor fan to melt accumulated frost and keep the heat pump delivering efficient heat.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCommon failure symptoms:\u003c\/strong\u003e When the \u003cstrong\u003e46K67\u003c\/strong\u003e fails, the outdoor coil may build up heavy ice with no defrost, defrost may run continuously, the outdoor fan may behave erratically, or the system may lose heating capacity and lean on backup electric heat. Corroded relays, a cracked board, or no response from the diagnostic LED point to a failed control.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy OEM matters:\u003c\/strong\u003e This board's timing and relay logic are calibrated specifically for Lennox reversing-valve and coil configurations. Substitute boards with mismatched timing or wiring can trigger nuisance defrosts, valve slugging, or compressor stress. Installing the factory \u003cstrong\u003e46K67\u003c\/strong\u003e guarantees proper timing sequences, correct fit, and reliable defrost performance for your Lennox equipment.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081131573619,"sku":"LNX-46K67","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-46K67.jpg?v=1783760048","url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-defrost-control-board-r47181-001-46k67","provider":"National HVAC Parts","version":"1.0","type":"link"}