{"product_id":"oem-lennox-defrost-control-sensor-63k46","title":"OEM Lennox Defrost Control Sensor — 63K46","description":"\u003cp\u003eThe genuine OEM Lennox \u003cstrong\u003e63K46\u003c\/strong\u003e defrost control sensor monitors outdoor coil temperature on your Lennox heat pump and signals the control board when a defrost cycle is needed. Accurate temperature feedback from this sensor keeps the outdoor coil clear of frost buildup, protecting heating capacity and preventing compressor strain during cold-weather operation.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCommon failure symptoms:\u003c\/strong\u003e A failing defrost sensor commonly causes excessive ice accumulation on the outdoor unit, defrost cycles that run too long or not at all, reduced heating output, unexpected auxiliary heat use, and higher energy bills. You may also see the system fail to exit defrost or trip fault codes at the control board.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy OEM matters:\u003c\/strong\u003e Lennox calibrates the resistance curve of the \u003cstrong\u003e63K46\u003c\/strong\u003e to match its defrost board logic precisely. Aftermarket sensors with different tolerances can cause mistimed defrost cycles, nuisance faults, or coil damage. Choosing the factory OEM part ensures correct temperature readings, reliable defrost operation, and full compatibility with your Lennox control system. Ships same day when ordered before the cutoff.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081145991539,"sku":"LNX-63K46","price":24.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-defrost-control-sensor-63k46","provider":"National HVAC Parts","version":"1.0","type":"link"}