{"product_id":"oem-lennox-spark-wire-harness-18k27","title":"OEM Lennox Spark Wire Harness — 18K27","description":"\u003cp\u003eThe genuine OEM Lennox \u003cstrong\u003e18K27\u003c\/strong\u003e spark wire harness carries the high-voltage ignition signal from the control board to the spark igniter in your Lennox furnace. This dedicated harness is built with the correct insulation, connectors, and length to deliver a strong, consistent spark for reliable burner ignition. As an exact factory replacement, it plugs in cleanly without splicing or adapters.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCommon failure symptoms:\u003c\/strong\u003e A worn or damaged \u003cstrong\u003e18K27\u003c\/strong\u003e harness can cause weak or intermittent ignition, delayed light-off, failure to ignite, or repeated ignition lockouts. Cracked insulation, corroded terminals, or a loose connector may let the spark leak to ground, resulting in a furnace that clicks or attempts to start but never fires. Heat and vibration over time are frequent causes of harness degradation.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy OEM matters:\u003c\/strong\u003e High-voltage spark wiring must maintain proper insulation and secure connections to fire safely and consistently. Generic wire substitutes may not withstand the heat or voltage near the burner assembly, leading to arcing or premature failure. Installing the authentic OEM \u003cstrong\u003e18K27\u003c\/strong\u003e harness ensures dependable ignition and the correct, safe fit for your Lennox equipment.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081114042739,"sku":"LNX-18K27","price":19.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-igniter-silicon-carbide-LNX-18K27.jpg?v=1783763649","url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-spark-wire-harness-18k27","provider":"National HVAC Parts","version":"1.0","type":"link"}