Jura S9 fill system error - clicking solenoid

Hi.

I was advised to replace the S9 Solenoid valve due to a loud click it makes when I try to fill the system. (After 1 or 2 attempts, it stops making the noise.)

I got a replacement and the same thing happened.

Do you know why the valve makes a clicking noise? Please let me know what else I need to do!

Thank you all in advance.