{"product_id":"oem-lennox-flame-sensor-52m72","title":"OEM Lennox Flame Sensor — 52M72","description":"\u003cp\u003eThe genuine OEM Lennox \u003cstrong\u003e52M72\u003c\/strong\u003e flame sensor is a critical safety component in your gas furnace. It uses flame rectification to confirm that the burners have actually ignited, sending a small microamp signal back to the control board. If the board doesn't sense a flame, it shuts off the gas valve to prevent unburned gas from accumulating — so a healthy sensor is essential for reliable, safe heating.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCommon failure symptoms:\u003c\/strong\u003e A dirty, corroded, or failing flame sensor is one of the most frequent causes of intermittent heating. You may notice the furnace igniting and then shutting down after a few seconds (short cycling), the blower running with no heat, or repeated ignition lockouts. Over time, oxidation and carbon buildup on the metal rod weaken the flame signal until the board no longer registers it.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy OEM matters:\u003c\/strong\u003e The Lennox \u003cstrong\u003e52M72\u003c\/strong\u003e is engineered to the exact rod length, alloy, and mounting geometry your furnace's control logic expects. Aftermarket substitutes can produce a weak or unstable microamp reading that triggers nuisance lockouts. Installing the correct OEM part restores dependable ignition sensing and keeps your Lennox system operating within factory specifications.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081141338483,"sku":"LNX-52M72","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-52M72.jpg?v=1783761032","url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-flame-sensor-52m72","provider":"National HVAC Parts","version":"1.0","type":"link"}