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A relay board is an electronic component that controls high-power devices like pumps, fans, or valves based on signals from the main controller. In boiler and burner systems, the relay board ensures that electrical loads are switched safely and reliably. This relay board is a common replacement part among boiler spare parts and heating equipment components, often needed when relays fail or contacts wear out. Its integration into gas burner parts helps manage the sequence of operation. Whether you are troubleshooting a non-functioning component or performing preventive maintenance, this relay board provides a straightforward solution for restoring system functionality.