{"product_id":"st9120g2008-honeywell-control-circuit-board","title":"ST9120G2008 | Honeywell Control Circuit Board","description":"\u003ch4\u003eDescription \u003c\/h4\u003e\n\u003cp data-start=\"144\" data-end=\"396\"\u003eThe Honeywell ST9120G2008 is a furnace control circuit board used in Honeywell, Tempstar, Heil, and ICP HVAC systems. Serving as the system’s “brain,” it manages fan control and monitors safety sensors and switches to regulate furnace operation.\u003c\/p\u003e\n\u003cp data-start=\"284\" data-end=\"574\" class=\"\"\u003e \u003c\/p\u003e\n\u003cp data-start=\"284\" data-end=\"574\" class=\"\"\u003e \u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications \u003c\/h4\u003e\n\u003ctable width=\"100%\" style=\"height: 108px; width: 100%;\"\u003e\n\u003ctbody\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003cth style=\"width: 32.7273%; text-align: left; height: 19.6px;\" class=\"text-left text-body1 text-bold py-10 pr-10 desktop:pr-[10rem] desktop:text-nowrap\"\u003eCondition\u003c\/th\u003e\n\u003ctd style=\"width: 66.9091%; height: 19.6px;\" class=\"text-left text-body1 py-10 desktop:w-[60%]\"\u003eNew\/Never Used Surplus\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003cth style=\"width: 32.7273%; text-align: left; height: 19.6px;\" class=\"text-left text-body1 text-bold py-10 pr-10 desktop:pr-[10rem] desktop:text-nowrap\"\u003eBrand\u003c\/th\u003e\n\u003ctd style=\"width: 66.9091%; height: 19.6px;\" class=\"text-left text-body1 py-10 desktop:w-[60%]\"\u003e\u003cspan data-sheets-root=\"1\"\u003eHoneywell\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003cth style=\"width: 32.7273%; text-align: left; height: 19.6px;\"\u003eCategory\u003c\/th\u003e\n\u003ctd style=\"width: 66.9091%; height: 19.6px;\"\u003e\n\u003cdiv class=\"mt-1 md:mt-0 column-left basis-2\/4 divide-y divide-rad-gray-10 border-b-[0.0625rem] border-rad-gray-10 md:border-0\"\u003e\n\u003cdiv class=\"flex gap-[1.75rem] md:gap-x-0 xl:gap-x-[1.875rem]\"\u003e\n\u003cdiv class=\"text-body-4 w-full font-light py-5 pl-4 md:py-6 md:pl-6 text-rad-gray-70\"\u003e\n\u003cdiv class=\"max-w-[8rem] break-words\"\u003e\n\u003cspan\u003e\u003c\/span\u003eHVAC Controls\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003cth style=\"width: 32.7273%; text-align: left; height: 19.6px;\"\u003e\u003cspan\u003ePart Number\u003c\/span\u003e\u003c\/th\u003e\n\u003ctd style=\"width: 66.9091%; height: 19.6px;\"\u003e\u003cspan data-sheets-root=\"1\"\u003eST9120G2008\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003cth style=\"width: 32.7273%; text-align: left; height: 19.6px;\"\u003e\u003cspan\u003eSubcategory\u003c\/span\u003e\u003c\/th\u003e\n\u003ctd style=\"width: 66.9091%; height: 19.6px;\"\u003e\u003cspan data-sheets-root=\"1\"\u003e\u003cspan\u003eFurnace Control Circuit Boards\u003c\/span\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 10px;\"\u003e\n\u003cth style=\"width: 32.7273%; text-align: left; height: 10px;\"\u003e\u003cspan\u003eWeight\u003c\/span\u003e\u003c\/th\u003e\n\u003ctd style=\"width: 66.9091%; height: 10px;\"\u003e\u003cspan\u003e0.65 lbs\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003cspan style=\"font-size: 0.875rem;\"\u003e \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch4\u003eInformation About ST9120G2008\u003c\/h4\u003e\n\u003cp\u003eThe ST9120G2008 is part of Honeywell’s ST9120G series of furnace control circuit boards, engineered to serve as the central control hub (“brain”) for HVAC systems deployed in Honeywell, Tempstar, Heil, and ICP furnace models. This OEM board coordinates fan operation, monitors safety switches, and manages system timing. It includes wiring harnesses to retrofit older furnace control configurations, enabling straightforward compatibility with legacy setups. Compact in size (~6 × 3 inches), this durable board offers efficient diagnostics via integrated LED fault indicators and comes with clear installation diagrams—making it ideal for maintenance and replacement in residential heating systems .\u003c\/p\u003e\n\u003ch4\u003eKey Features:\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eOEM Direct Replacement: Compatible with models originally requiring part numbers ST9120G2008, ST9120G2016 (Honeywell #1138‑83‑200A), and various ICP\/Tempstar\/Heil OEM part variants.\u003c\/li\u003e\n\u003cli\u003eCompact Form Factor: Measures approximately 6 × 3 inches, ensuring easy integration within furnace housings without space constraints.\u003c\/li\u003e\n\u003cli\u003eComprehensive Wiring Harness Kit: Includes multiple adapter harnesses to support a variety of connector types—making it ideal for retrofitting older system configurations without rewiring.\u003c\/li\u003e\n\u003cli\u003eLED Diagnostic Indicators: Built-in LEDs provide clear fault code readouts and operational status, simplifying troubleshooting and service validation.\u003c\/li\u003e\n\u003cli\u003eHigh Reliability and Durability: Constructed with robust electronic components to ensure consistent performance and longevity in residential HVAC applications.\u003c\/li\u003e\n\u003cli\u003eEasy Installation: Clear diagrammed instructions are included, making installation accessible to qualified HVAC technicians and DIY users alike.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe ST9120G2008 is a reliable and versatile OEM control board, ideal for replacement and retrofit use in compatible furnaces from Honeywell, ICP, Heil, and Tempstar. Its plug‑and‑play compatibility, diagnostic clarity, and compact design make it a trusted choice for restoring HVAC system control and safety functionality.\u003c\/p\u003e","brand":"Honeywell","offers":[{"title":"Default Title","offer_id":49105293672704,"sku":"ST9120G2008","price":535.08,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0388\/5331\/2557\/files\/71yMrgWhn4L._SL1500.jpg?v=1785544312","url":"https:\/\/alotechparts.com\/products\/st9120g2008-honeywell-control-circuit-board","provider":"Alo Tech Solutions","version":"1.0","type":"link"}