{"product_id":"oem-lennox-flame-sensor-49m84","title":"OEM Lennox Flame Sensor — 49M84","description":"\u003cp\u003eThe genuine OEM Lennox \u003cstrong\u003e49M84\u003c\/strong\u003e flame sensor is a critical safety component in your gas furnace. It uses flame rectification to confirm that the burners have ignited, signaling the control board to keep the gas valve open. Designed as a direct factory replacement, the \u003cstrong\u003e49M84\u003c\/strong\u003e ensures precise fit and reliable flame detection for compatible Lennox furnaces.\u003c\/p\u003e\u003ch3\u003eCommon Failure Symptoms\u003c\/h3\u003e\u003cp\u003eOver time, oxidation and carbon buildup coat the sensor rod, weakening the microamp signal the furnace relies on. Typical symptoms include the furnace lighting and then shutting down after a few seconds, short cycling, repeated ignition lockouts, or the blower running with no heat. A failing flame sensor is one of the most common causes of no-heat calls in cold weather.\u003c\/p\u003e\u003ch3\u003eWhy OEM Matters\u003c\/h3\u003e\u003cp\u003eAftermarket sensors often produce an out-of-spec flame signal that trips your furnace's safety logic, leading to nuisance lockouts. The OEM Lennox \u003cstrong\u003e49M84\u003c\/strong\u003e is calibrated to your furnace's ignition control for consistent, code-compliant operation and long service life. Choosing genuine Lennox parts protects your equipment warranty and keeps your system running safely.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081144058227,"sku":"LNX-49M84","price":19.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-flame-sensor-straight-LNX-49M84.jpg?v=1783761029","url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-flame-sensor-49m84","provider":"National HVAC Parts","version":"1.0","type":"link"}