{"product_id":"oem-lennox-flame-sensor-39f95","title":"OEM Lennox Flame Sensor — 39F95","description":"\u003cp\u003eThe genuine OEM Lennox \u003cstrong\u003e39F95\u003c\/strong\u003e flame sensor is a critical safety component in your Lennox gas furnace. Using the principle of flame rectification, it confirms that a flame is actually present after the igniter fires. If the control board doesn't detect a healthy flame signal within seconds, it shuts off the gas valve to prevent unburned gas from accumulating — protecting your home from a dangerous condition.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCommon failure symptoms:\u003c\/strong\u003e A dirty, corroded, or failed \u003cstrong\u003e39F95\u003c\/strong\u003e flame sensor is one of the most common causes of a furnace that lights briefly then shuts down. Watch for short-cycling, the burner igniting and going out after a few seconds, no heat despite the igniter glowing, or repeated ignition lockouts. Oxidation buildup on the sensor rod weakens the microamp flame signal over time.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy OEM matters:\u003c\/strong\u003e The flame sensor's rod material, length, and mounting position are precisely calibrated to your Lennox burner assembly. The factory \u003cstrong\u003e39F95\u003c\/strong\u003e ensures a reliable flame-current reading and correct safety response. A mismatched aftermarket sensor can cause nuisance lockouts or fail to trip the safety shutoff — reasons to trust the OEM part for both performance and safety.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081107292531,"sku":"LNX-39F95","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-39F95.jpg?v=1783761024","url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-flame-sensor-39f95","provider":"National HVAC Parts","version":"1.0","type":"link"}