Armstrong Air R40403-003 Furnace Control Board – OEM Circuit Board for Ignition & System Management
The Armstrong Air R40403-003 Furnace Control Circuit Board is a genuine OEM component designed to manage key furnace operations including ignition timing, blower control, and safety sequences. This integrated control board coordinates communication between system sensors and components, helping your furnace operate efficiently and safely during every heating cycle.
Ideal for replacing a failed or outdated board, the R40403-003 restores furnace performance by regulating the sequence of operations from the initial call for heat to post-cycle fan delay. With full compatibility for multiple Armstrong Air models, this board is a trusted solution for eliminating erratic heating behavior and error codes.
Key Features:
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OEM furnace control board for Armstrong Air gas furnaces
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Controls ignition sequence, blower delay, and safety checks
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Plug-and-play replacement for seamless installation
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Monitors pressure switches, flame sensors, gas valve operation, and fan motor timing
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Resolves issues like no heat, failed starts, or intermittent operation
Alternate / Replacement Part Numbers:
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R40403-001
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R40403-002
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20054501
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20054502
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ST9120C 2010
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1138-83-1002A
If your Armstrong Air furnace is showing startup errors or erratic behavior, upgrading to the R40403-003 control board is a reliable and cost-effective fix that restores consistent, safe system function.
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