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Your cart is empty.The R40403-003 Furnace Blower Control Circuit Board is an upgraded replacement for models such as 40403-001, 40403-002, and ST9120A/B/C. It offers wide compatibility with various older control board models and delivers superior electrical performance and durability. With a dip switch for adjustable blower delay and a 5A fuse protecting the 24V circuit, it ensures safe and stable system operation. Installation is made easy without the need for extra tools, and it fits seamlessly with both original and updated wiring setups for a smooth installation experience.
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