{"product_id":"oem-lennox-flame-sensor-12f19","title":"OEM Lennox Flame Sensor — 12F19","description":"\u003cp\u003eThe genuine OEM Lennox \u003cstrong\u003e12F19\u003c\/strong\u003e flame sensor is a safety component in your Lennox gas furnace that verifies the burner flame is actually present after ignition. Using the flame's electrical conductivity, the sensor signals the control board to keep the gas valve open only when a flame is confirmed, and to shut off fuel immediately if it is not, preventing dangerous unburned gas buildup.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCommon failure symptoms:\u003c\/strong\u003e A dirty, corroded, or failing \u003cstrong\u003e12F19\u003c\/strong\u003e sensor is a leading cause of furnaces that light briefly then shut down. You may see the burners ignite for a few seconds before going out, repeated ignition attempts, short cycling on a call for heat, or a furnace lockout with no heat at all.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy OEM matters:\u003c\/strong\u003e The Lennox \u003cstrong\u003e12F19\u003c\/strong\u003e is built with the correct rod length, mounting, and material to read a stable flame-rectification signal your control board expects. Aftermarket sensors can give weak or erratic readings that trigger nuisance shutdowns. Choosing the factory OEM sensor ensures reliable flame detection, safe operation, and full compatibility with your Lennox furnace.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081115746675,"sku":"LNX-12F19","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-12F19.jpg?v=1783761006","url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-flame-sensor-12f19","provider":"National HVAC Parts","version":"1.0","type":"link"}