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The Main Board External Unit 09 is a control board designed for external units in boiler or burner systems. This board manages key functions such as ignition, flame monitoring, and safety interlocks for the external unit. As a critical electronic component, it ensures reliable operation and communication with the main boiler controller. Whether you are repairing a faulty external unit or upgrading your system, this main board is a precise replacement part. It supports efficient heating performance and is commonly used in modern gas burner and boiler setups.