{"product_id":"oem-lennox-flame-sensor-43k53","title":"OEM Lennox Flame Sensor — 43K53","description":"\u003cp\u003eThe genuine OEM Lennox \u003cstrong\u003e43K53\u003c\/strong\u003e flame sensor verifies that your burners have actually ignited by using flame rectification to send a small microamp signal back to the control board. This safety-critical component tells your Lennox furnace it is safe to keep the gas valve open; without a valid signal, the board shuts the valve to prevent unburned gas from accumulating.\u003c\/p\u003e\u003cp\u003eCommon symptoms of a failing flame sensor include a furnace that lights briefly then shuts off after a few seconds (short-cycling), repeated ignition attempts ending in lockout, or intermittent no-heat calls. Oxidation, carbon buildup, and cracked ceramic insulators all weaken the flame signal until the board no longer detects a stable flame.\u003c\/p\u003e\u003cp\u003eUsing the OEM \u003cstrong\u003e43K53\u003c\/strong\u003e matters because Lennox control boards are calibrated to a specific flame-signal range and rod geometry; an incorrect sensor can read low, cause nuisance lockouts, or fail intermittently. This factory sensor restores a clean, reliable flame signal and safe, uninterrupted heating for your Lennox equipment.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081106178419,"sku":"LNX-43K53","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-43K53.jpg?v=1783761026","url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-flame-sensor-43k53","provider":"National HVAC Parts","version":"1.0","type":"link"}