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The module board is an auxiliary control board that handles specific functions such as communication, display, or expansion in a boiler or burner system. It often works in conjunction with the main board to provide additional features or interface with external controls. A defective module board can lead to loss of certain functions or error codes. Replacing it with a compatible module board can restore full system capability. When selecting a module board, verify the model and revision to ensure seamless integration with your existing control system.