{"product_id":"roboa-r40403-003-furnace-blower-control-board-st9120a-b-c-compatible","title":"ROBOA R40403-003 Furnace Blower Control Board – ST9120A\/B\/C Compatible","description":"\u003ch3\u003eOverview\u003c\/h3\u003e\u003cp\u003eMeet the ROBOA Upgraded R40403-003 Furnace Blower Control Board, a direct replacement designed to work with ST9120A, ST9120B, and ST9120C controls and a broad range of major brands. This board is built to fit Armstrong, Allied, Ducane, Magic Chef systems, among others, offering a familiar form and dependable function for installers and homeowners alike.\u003c\/p\u003e\u003cp\u003eFrom the moment you handle it, you may notice the emphasis on durability and reliable design. The upgraded power components are chosen to help minimize overheating and extend the life of your furnace blower control. A 5-amp replaceable fuse protects the 24V circuit, while a dip switch provides adjustable blower delay settings to better align with your system’s timing.\u003c\/p\u003e\u003ch3\u003eKey Benefits and Real-World Use\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eDirect replacement capability reduces on-site guesswork and supports wide compatibility with ST9120A\/B\/C controls.\u003c\/li\u003e\n\u003cli\u003eUpgraded construction uses robust PCB materials and precision welding for stable operation in challenging conditions.\u003c\/li\u003e\n\u003cli\u003eMoisture resistance helps maintain performance in varying environments, contributing to long-term reliability.\u003c\/li\u003e\n\u003cli\u003eIncorporates a 5-amp fuse for circuit protection and a dip switch for adjustable blower delay settings.\u003c\/li\u003e\n\u003cli\u003eNo wiring modifications are required, enabling a plug-and-play style installation when wiring is labeled and documented.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eEstimated benefits include smoother blower control, reduced risk of overheating for the 24V circuit, and a simpler upgrade path for older or aging furnace control boards. While results can vary by system, this board is designed to fit a wide array of configurations while preserving original control behavior wherever possible.\u003c\/p\u003e\u003ch3\u003eTechnical Specifications at a Glance\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eOperating Line Voltage: 85–135 VAC, 50\/60 Hz\u003c\/li\u003e\n\u003cli\u003eSecondary Control Voltage: 18–30 VAC\u003c\/li\u003e\n\u003cli\u003eMax Blower Load: 15 FLA \/ 30 LRA @ 120 VAC\u003c\/li\u003e\n\u003cli\u003eMax Inducer Load: 3 FLA \/ 10 LRA @ 120 VAC\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eFor best results, verify compatibility with your model and keep a quick reference photo of existing wiring before disconnecting components. The board is designed to work with both original and updated systems, and its compact, well-assembled layout supports straightforward installation in constrained spaces.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Which controls and brands is the ROBOA R40403-003 compatible with?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: It directly replaces R40403-001\/002\/003 and works with ST9120A, B, and C controls across Armstrong, Allied, Ducane, Magic Chef, and other major brands.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: What installation guidance helps ensure a smooth replacement?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: No wiring modifications are needed; for best results, take a photo of the existing wiring before disconnecting, then plug in as labeled.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"ROBOA","offers":[{"title":"Default Title","offer_id":47467813273774,"sku":"B0CY7YZHVH","price":95.66,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0735\/6012\/9710\/files\/roboa-upgraded-blower-board-pcb.jpg?v=1770381552","url":"https:\/\/handyskook.ca\/products\/roboa-r40403-003-furnace-blower-control-board-st9120a-b-c-compatible","provider":"HandySkook","version":"1.0","type":"link"}