{"product_id":"oem-lennox-flame-sensor-51m14","title":"OEM Lennox Flame Sensor — 51M14","description":"\u003cp\u003eThe genuine OEM Lennox \u003cstrong\u003e51M14\u003c\/strong\u003e flame sensor confirms that your furnace burners have successfully ignited. Using flame rectification, this rod detects the presence of a flame and signals the control board to keep the gas valve open — an essential safety function that prevents raw gas from accumulating in the combustion chamber.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCommon failure symptoms:\u003c\/strong\u003e A dirty, oxidized, or failing \u003cstrong\u003e51M14\u003c\/strong\u003e is one of the most frequent causes of furnace lockout. Typical signs include the burners lighting for a few seconds then shutting off, repeated ignition attempts, or a furnace that cycles on and off without producing sustained heat. A coated sensor rod loses its ability to conduct the tiny micro-amp signal the control board needs.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy OEM matters:\u003c\/strong\u003e The correct rod length, positioning, and alloy are critical for a stable flame-sense signal. The OEM Lennox \u003cstrong\u003e51M14\u003c\/strong\u003e is built to factory tolerances so it seats properly in the burner assembly and delivers a reliable signal, eliminating the intermittent lockouts that generic sensors often cause in Lennox equipment.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081103819123,"sku":"LNX-51M14","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-51M14.jpg?v=1783761031","url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-flame-sensor-51m14","provider":"National HVAC Parts","version":"1.0","type":"link"}