{"product_id":"oem-lennox-flame-sensor-w-lead-83l72","title":"OEM Lennox Flame Sensor w\/ Lead — 83L72","description":"\u003cp\u003eThe genuine OEM Lennox \u003cstrong\u003e83L72\u003c\/strong\u003e flame sensor with lead confirms that a flame is present after ignition. Using flame rectification, it sends a small microamp signal to the control board verifying the burner has lit — if no flame is detected, the board closes the gas valve to prevent unburned gas from accumulating. This makes the sensor a core safety device in your Lennox furnace.\u003c\/p\u003e\u003cp\u003eA dirty or failing flame sensor is one of the most common causes of a furnace that lights briefly then shuts off (short cycling on ignition lockout). You may also see the burner ignite for a few seconds before the gas valve closes, followed by repeated retry attempts. Oxidation and carbon buildup on the rod weaken the flame signal over time.\u003c\/p\u003e\u003cp\u003eThe pre-wired \u003cstrong\u003e83L72\u003c\/strong\u003e assembly is built to the exact rod length, position, and lead length required for correct flame sensing in your Lennox unit. OEM ensures a strong, stable microamp signal and proper fit — restoring reliable ignition and safe operation.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081134162291,"sku":"LNX-83L72","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-83L72.jpg?v=1783761001","url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-flame-sensor-w-lead-83l72","provider":"National HVAC Parts","version":"1.0","type":"link"}