I just set up a kegerator 2weeks ago. Carbed the beer at 34 degrees F for 2 weeks at 9psi. have not touched anything eor the 2 weeks. i am using 5 gal korney keg . attached the coupler last night to try it and no flow. it worked when i was running cleaner and sanitizer thru 2 weeks ago. what am i missing doing :'(? Thanks Steve