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You probably have a bit of debris causing it from closing all the way.

Can you turn it on, open your needle valve all the way and blow "forceful" CO2 through it to get the debris out?

Alternatively, you can remove it and use compressed air. Just make sure the solenoid is open.

You may have to jiggle it a bit to get the debris out.
 

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I feel confused. I just shut off the main valve of CO2 cylinder. but when I turn on needle valve, I see the number of bubbles increases. How does this happen? there should be no CO2 out when the main valve is shut.
Whenever you turn the CO2 cylinder off; you will have "remnant" CO2 gas remaining between that closed cylinder valve and your needle valve. It may take a little while for all the gas to disperse through the solenoid and needle valve (if they are open), but it should quit flowing after a little while.
 
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