Hello, have the same problem with my Siemens q9. Warranty expired 6 weeks ago. Was the last half year several times for repair. Tank leaked, there was no milk foam and there was also no error detected, machine came back and the same error again. Immediately back to the workshop, again no error found. 2 days later came an email that the front was replaced, but why no one knows in the workshop. Machine came back and milk foam went, now again the same problem and when making coffee with the one grinder appears after the machine was switched on immediately, device please cool down. Siemens and the workshop unfortunately does not meet me. Repair amounts to 270.00 euros.