.22 Cricket Help

My cricket will not fire! Trigger is good, hammer is good, the valve won't release air. I just replaced orings then filled gun to 150 bar and everything worked fine. Brought gun up to 230 bar and now the hammer won't release air. I did not touch regulator settings or interior orings. Seems like valve lock? Could regulator be leaking by? Any help would be appreciated. Thanks in advance