I have a fairly new perlick regulator, served maybe 6 kegs on it. I just kegged a beer, hooked up the has line to the keg, tried to give it a quick shot of 30 psi to seat the latch and nothing happened and I was getting no gas at all into either keg. It was working fine minutes before and the tank definitely has gas. After some fiddling to test each part of the system with no success, I took the (cheaper) regulator off an older CO2 tank and everything worked fine. I've concluded that the regulator has failed.
How could I have done that? Anything else I can test on the regulator? I find it hard to believe it just failed like that.