{"product_id":"oem-lennox-hot-surface-ignitor-25n42","title":"OEM Lennox Hot Surface Ignitor — 25N42","description":"\u003cp\u003eThe genuine OEM Lennox \u003cstrong\u003e25N42\u003c\/strong\u003e hot surface ignitor (HSI) is responsible for igniting the burners in your Lennox gas furnace. When a heating cycle begins, the control board sends voltage to the ignitor, heating its element until it glows and lights the gas flowing from the open valve. A properly functioning HSI is the foundation of safe, reliable, on-demand heat.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCommon failure symptoms:\u003c\/strong\u003e The furnace attempts to start but never produces heat, you notice repeated ignition clicks followed by lockout, the ignitor fails to glow, or heat becomes intermittent. Hot surface ignitors are brittle and degrade over time from repeated thermal cycling, making them a leading cause of no-heat service calls.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy OEM matters:\u003c\/strong\u003e The OEM Lennox \u003cstrong\u003e25N42\u003c\/strong\u003e is engineered to the exact resistance, wattage, and mounting specifications of your Lennox furnace. Aftermarket alternatives can misfire, warp, or wear out quickly due to mismatched electrical characteristics. Installing the genuine Lennox part guarantees correct fit, proper ignition timing, and long-lasting performance.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081140257139,"sku":"LNX-25N42","price":29.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-igniter-silicon-carbide-LNX-25N42.jpg?v=1783762019","url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-hot-surface-ignitor-25n42","provider":"National HVAC Parts","version":"1.0","type":"link"}