{"product_id":"100870-01-lennox-surelight-two-stage-variable-speed-furnace-control-board","title":"100870-01 | Lennox SureLight Two-Stage Variable-Speed Furnace Control Board","description":"\u003ch4\u003eDescription \u003c\/h4\u003e\n\u003cp data-end=\"396\" data-start=\"144\"\u003eThe Lennox 100870-01 SureLight control board is a furnace control module designed for two-stage, variable-speed ignition systems. It manages essential furnace operations—including ignition sequencing, blower control, and flame sensing—while facilitating diagnostic feedback through LED indicators.\u003c\/p\u003e\n\u003cp class=\"\" data-end=\"574\" data-start=\"284\"\u003e \u003c\/p\u003e\n\u003cp class=\"\" data-end=\"574\" data-start=\"284\"\u003e \u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications \u003c\/h4\u003e\n\u003ctable style=\"width: 100%; height: 291.313px;\"\u003e\n\u003ctbody\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 29.2631%; height: 19.5938px;\"\u003e\u003cstrong\u003eCondition\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 67.8592%; height: 19.5938px;\"\u003eNew\/Never Used Surplus\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 29.2631%; height: 19.5938px;\"\u003e\u003cstrong\u003eBrand\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 67.8592%; height: 19.5938px;\"\u003eLennox\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 29.2631%; height: 19.5938px;\"\u003e\u003cstrong\u003eCategory\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 67.8592%; height: 19.5938px;\"\u003eFurnace Control Boards\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 29.2631%; height: 19.5938px;\"\u003e\u003cstrong\u003ePart Number\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 67.8592%; height: 19.5938px;\"\u003e100870-01\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 29.2631%; height: 19.5938px;\"\u003e\u003cstrong\u003eSubcategory\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 67.8592%; height: 19.5938px;\"\u003eSureLight Two-Stage Variable-Speed Control Boards\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 29.2631%; height: 19.5938px;\"\u003e\u003cstrong\u003eHeating Stages\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 67.8592%; height: 19.5938px;\"\u003eTwo-stage\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 29.2631%; height: 19.5938px;\"\u003e\u003cstrong\u003eBlower Control\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 67.8592%; height: 19.5938px;\"\u003eVariable-speed\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 29.2631%; height: 19.5938px;\"\u003e\u003cstrong\u003eDiagnostic Features\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 67.8592%; height: 19.5938px;\"\u003eLED fault code indicators\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 29.2631%; height: 19.5938px;\"\u003e\u003cstrong\u003eAccessory Terminals\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 67.8592%; height: 19.5938px;\"\u003eEAC (electronic air cleaner), HUM (humidifier)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 29.2631%; height: 19.5938px;\"\u003e\u003cstrong\u003eConfiguration Options\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 67.8592%; height: 19.5938px;\"\u003eDIP switches and jumpers\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 29.2631%; height: 19.5938px;\"\u003e\u003cstrong\u003eCompatibility\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 67.8592%; height: 19.5938px;\"\u003eSelect Lennox furnace models\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 35.5938px;\"\u003e\n\u003ctd style=\"width: 29.2631%; height: 35.5938px;\"\u003e\u003cstrong\u003eInstallation\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 67.8592%; height: 35.5938px;\"\u003eDirect replacement, no rewiring\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 20.5938px;\"\u003e\n\u003ctd style=\"width: 29.2631%; height: 20.5938px;\"\u003e\u003cstrong\u003eDimensions\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 67.8592%; height: 20.5938px;\"\u003e6 × 6 × 6 inches\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 29.2631%; height: 19.5938px;\"\u003e\u003cstrong\u003eWeight\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 67.8592%; height: 19.5938px;\"\u003e1 lb (0.45 kg)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch4\u003e\u003cbr\u003e\u003c\/h4\u003e\n\u003ch4\u003eInformation About \u003cspan data-sheets-root=\"1\"\u003e100870-01\u003c\/span\u003e\n\u003c\/h4\u003e\n\u003cp data-start=\"523\" data-end=\"1098\"\u003eThe 100870-01 is part of Lennox’s SureLight series, developed to offer reliable ignition and blower management for advanced furnace configurations. This board coordinates the full heating cycle, including ignition timing, flame verification, and blower motor control, ensuring optimal performance and safety. It features LED diagnostic indicators to simplify fault detection, as well as terminals for connecting accessories such as electronic air cleaners and humidifiers. Designed for direct replacement compatibility with select Lennox models, it allows straightforward installation without rewiring, and its durable construction ensures long-term operation in demanding furnace environments.\u003c\/p\u003e\n\u003cp data-start=\"1146\" data-end=\"1165\"\u003e\u003cstrong data-start=\"1146\" data-end=\"1163\"\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-start=\"1166\" data-end=\"2161\"\u003e\n\u003cli data-start=\"1166\" data-end=\"1282\"\u003e\n\u003cp data-start=\"1168\" data-end=\"1282\"\u003e\u003cstrong data-start=\"1168\" data-end=\"1201\"\u003eTwo-stage heating capability:\u003c\/strong\u003e Controls both low and high heating stages for improved efficiency and comfort.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1283\" data-end=\"1411\"\u003e\n\u003cp data-start=\"1285\" data-end=\"1411\"\u003e\u003cstrong data-start=\"1285\" data-end=\"1319\"\u003eVariable-speed blower control:\u003c\/strong\u003e Adjusts airflow dynamically to match heating demand and maintain consistent temperatures.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1412\" data-end=\"1524\"\u003e\n\u003cp data-start=\"1414\" data-end=\"1524\"\u003e\u003cstrong data-start=\"1414\" data-end=\"1444\"\u003eLED diagnostic indicators:\u003c\/strong\u003e Provides real-time fault codes for fast troubleshooting and reduced downtime.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1525\" data-end=\"1636\"\u003e\n\u003cp data-start=\"1527\" data-end=\"1636\"\u003e\u003cstrong data-start=\"1527\" data-end=\"1562\"\u003eAccessory terminal integration:\u003c\/strong\u003e Supports direct connection for electronic air cleaners and humidifiers.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1637\" data-end=\"1773\"\u003e\n\u003cp data-start=\"1639\" data-end=\"1773\"\u003e\u003cstrong data-start=\"1639\" data-end=\"1672\"\u003eConfigurable system settings:\u003c\/strong\u003e Includes DIP switches and jumpers for customizing fan delay, thermostat staging, and cycle timing.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1774\" data-end=\"1890\"\u003e\n\u003cp data-start=\"1776\" data-end=\"1890\"\u003e\u003cstrong data-start=\"1776\" data-end=\"1803\"\u003eDirect OEM replacement:\u003c\/strong\u003e Matches original specifications for Lennox systems, ensuring seamless compatibility.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1891\" data-end=\"2012\"\u003e\n\u003cp data-start=\"1893\" data-end=\"2012\"\u003e\u003cstrong data-start=\"1893\" data-end=\"1921\"\u003eCompact and lightweight:\u003c\/strong\u003e Measures approximately 6 × 6 × 6 inches and weighs around 1 pound for easy installation.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"2163\" data-end=\"2312\"\u003eThe 100870-01 delivers the reliability and precision required for safe and efficient operation of two-stage, variable-speed Lennox furnace systems.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":49105244586240,"sku":"100870-01","price":712.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0388\/5331\/2557\/files\/51ItKkP2u8L.jpg?v=1785543387","url":"https:\/\/alotechparts.com\/products\/100870-01-lennox-surelight-two-stage-variable-speed-furnace-control-board","provider":"Alo Tech Solutions","version":"1.0","type":"link"}