GAGGIA CLASSIC PRO General Troubleshooting
System Nominal
The Gaggia Classic Pro is engineered with a vibration pump that must vibrate to function; the 'buzz' is the physical sound of the piston hitting its stroke 60 times per second. This is an intentional electromechanical byproduct of the solenoid design and does not indicate a failure unless accompanied by a complete lack of water flow.
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