{"product_id":"oem-lennox-honeywell-defrost-control-board-17m14","title":"OEM Lennox Honeywell Defrost Control Board — 17M14","description":"\u003cp\u003eThe genuine OEM Lennox \u003cstrong\u003e17M14\u003c\/strong\u003e is a Honeywell-built defrost control board for Lennox heat pump systems. It reads the defrost thermostat and runs a demand or time\/temperature defrost algorithm, then commands the reversing valve, outdoor fan relay, and auxiliary heat as needed to clear frost from the outdoor coil and maintain efficient heating in cold weather.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCommon failure symptoms:\u003c\/strong\u003e A failing \u003cstrong\u003e17M14\u003c\/strong\u003e commonly causes an ice-covered outdoor unit that never defrosts, defrost cycles that run endlessly, the outdoor fan energizing at the wrong time, constant auxiliary heat, or a total loss of heat-pump heating. Burnt or pitted relays, a blank or blinking fault LED, and heat-damaged traces indicate the board has failed.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy OEM matters:\u003c\/strong\u003e This Honeywell board is programmed with the exact defrost timing, sensor logic, and relay ratings Lennox specifies for their equipment. Aftermarket boards with different jumper options or firmware can mis-sequence defrost, chatter the reversing valve, or fail to protect the compressor. The factory \u003cstrong\u003e17M14\u003c\/strong\u003e ensures correct timing, proper terminals, and reliable defrost control for your Lennox system.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081131639155,"sku":"LNX-17M14","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-17M14.jpg?v=1783762004","url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-honeywell-defrost-control-board-17m14","provider":"National HVAC Parts","version":"1.0","type":"link"}