{"product_id":"oem-lennox-flame-sensor-17j56","title":"OEM Lennox Flame Sensor — 17J56","description":"\u003cp\u003eGenuine OEM Lennox \u003cstrong\u003e17J56\u003c\/strong\u003e flame sensor. This component verifies that a flame is present after ignition by generating a small flame-rectification current, telling the furnace control board it is safe to keep the gas valve open. It is a core safety device in your Lennox gas furnace and directly controls reliable, uninterrupted heating.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCommon failure symptoms:\u003c\/strong\u003e When the \u003cstrong\u003e17J56\u003c\/strong\u003e becomes coated with oxidation or carbon, or cracks with age, the burners light and then shut off after a few seconds — a classic short-cycling or \"clicks then no heat\" complaint. You may also see repeated ignition lockouts, weak or intermittent flame confirmation, and error codes pointing to loss of flame signal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy OEM matters:\u003c\/strong\u003e Lennox flame sensors are calibrated to the exact microamp signal range the furnace control board expects. An aftermarket rod with the wrong length, alloy, or mounting geometry can read a false weak signal and trigger nuisance lockouts even when the flame is healthy. Installing the factory \u003cstrong\u003e17J56\u003c\/strong\u003e guarantees correct fit, proper flame-rod positioning, and the rated signal strength your Lennox equipment was engineered around — restoring dependable, safe furnace operation.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081114304883,"sku":"LNX-17J56","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-17J56.jpg?v=1783761011","url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-flame-sensor-17j56","provider":"National HVAC Parts","version":"1.0","type":"link"}