{"product_id":"lennox-73k38-spark-ignitor-2-65-electrode-length-73k3801","title":"Lennox 73K38, Spark Ignitor, 2.65\" Electrode Length 73K3801","description":"\u003ch1\u003e\u003cstrong\u003eLennox P\/N 73K38 (73K3801) – Genuine OEM Spark Ignitor (DSI) Assembly\u003c\/strong\u003e\u003c\/h1\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003eThe \u003cstrong\u003eLennox 73K38 \u003c\/strong\u003e(Catalog 73K38) is a genuine OEM \u003cstrong\u003eDirect Spark Ignitor\u003c\/strong\u003e (DSI) and \u003cstrong\u003eflame sensor assembly\u003c\/strong\u003e designed for specialized Lennox, Armstrong, and Ducane gas furnaces. Unlike standard hot surface ignitors, this component uses \u003cstrong\u003ehigh-voltage electricity\u003c\/strong\u003e to create a consistent spark that instantly ignites the gas burners. It plays a critical role in the furnace's automated ignition sequence, ensuring efficient combustion and safe operation throughout the heating cycle. \u003c\/p\u003e\n\u003cp\u003eBeing a Genuine \u003cstrong\u003eOEM\u003c\/strong\u003e part \u003cstrong\u003efrom Lennox \u003c\/strong\u003eensures precise timing and reliable sparking under demanding combustion conditions. This assembly features a durable \u003cstrong\u003e2.65\u003c\/strong\u003e\" electrode length and a compact \"\u003cstrong\u003eL-shaped\u003c\/strong\u003e\" bracket for easy integration into the burner housing. Choosing the original factory replacement guarantees accurate fitment and supports the intended system safety protocols, preventing the erratic ignition issues common with low-quality aftermarket electrodes. \u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eKey Features and Function:\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDirect Spark Ignition (DSI):\u003c\/strong\u003e Delivers a consistent, high-voltage spark for fast and reliable burner startups.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGenuine OEM Reliability:\u003c\/strong\u003e Official Lennox replacement engineered for accurate fit and long-term durability in high-heat environments.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIntegrated Design:\u003c\/strong\u003e Serves as both the ignition electrode and the flame sensing rod in specific DSI-equipped models.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDurable Build:\u003c\/strong\u003e Constructed to withstand the harsh conditions of the combustion chamber without degradation. \u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eProduct Details and Key Specifications:\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e 73K38\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer:\u003c\/strong\u003e Lennox (Genuine OEM)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel\/Part Number: \u003c\/strong\u003e73K3801\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Type:\u003c\/strong\u003e Spark Ignitor \/ Spark Electrode\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eElectrode Style:\u003c\/strong\u003e L-Shaped\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eElectrode Length:\u003c\/strong\u003e 2.65\" (approx. 2 5\/8\")\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGross Shipping Weight:\u003c\/strong\u003e 1 LB \u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003e🛠️ HVAC Depot Pro Tip: The Electrode Gap\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eFor a reliable spark, the gap between the electrode tip and the burner surface must be exact (typically around 1\/8\"). Over time, heat can cause electrodes to warp. When installing the 73K3801, always verify the gap matches the manufacturer's specification. A gap that is too wide will fail to spark, while one that is too narrow may ground out and prevent ignition. \u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eThe 73K3801 is a direct OEM replacement for the following part numbers: \u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ch3\u003e\u003cstrong\u003eOEM \u0026amp; Catalog Numbers:\u003c\/strong\u003e\u003c\/h3\u003e\n73K38, 73K3801, 43K31.\u003c\/li\u003e\n\u003cli\u003e\n\u003ch3\u003e\u003cstrong\u003eReference Numbers:\u003c\/strong\u003e\u003c\/h3\u003e\nPSE-L39, Ref: L39, Ignitor DSI. \u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eExtensive Model Compatibility List:\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eNote: Use 'CTRL+F' to search for your specific model:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ch3\u003e\u003cstrong\u003eLennox 80MGF Series:\u003c\/strong\u003e\u003c\/h3\u003e\n80MGF2-45A, 80MGF2-60A, 80MGF2-75A, 80MGF2-75S, 80MGF3-75A-1.\u003c\/li\u003e\n\u003cli\u003e\n\u003ch3\u003e\u003cstrong\u003eOther Compatible Models:\u003c\/strong\u003e\u003c\/h3\u003e\nVarious Lennox furnaces using DSI technology, including specific configurations for model 62K50. \u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":52611927638379,"sku":"66255131954","price":45.65,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0922\/9683\/9531\/files\/73K38.jpg?v=1764018936","url":"https:\/\/tophvacparts.com\/products\/lennox-73k38-spark-ignitor-2-65-electrode-length-73k3801","provider":"HVAC Parts and Equipment Depot Open To Homeowners and Contractors","version":"1.0","type":"link"}