The Siemens EQ 5 Macchiato Plus coffee maker is experiencing issues where it grinds beans but fails to pass water through the coffee nozzles, resulting in dry grounds being deposited in the container. Users suspect blockages in the water supply or the brewing unit, with suggestions to clean or disassemble the brewer for thorough inspection. Common problems identified include malfunctioning solenoid valves, specifically the three-way valve, and potential leaks in the brewing block. Some users have successfully resolved similar issues by replacing gaskets or the brewing unit itself. The discussion emphasizes the importance of checking for clogs and ensuring proper water flow through the machine's components. Summary generated by the language model.