Greetings, relatively new kegerator owner here, looking for some troubleshooting advice. I have a dual tap system that I setup in November and has been working fine since then. During that time, I have changed out kegs a few different times and have been diligent about keeping keg lines, coupler and faucets clean. I usually end up replacing both kegs at the same time, and take that opportunity to flush the whole system. This most recent time though I only replaced one keg. After going through the normal cleaning routine, and tapping the new keg, the problems began. The first few pours were mostly foam, as expected, but then the flow slowed to a trickle before stopping completely. The Co2 tank still has gas, as the other keg still works fine. However, It seems as gas is only reaching one of the lines. I checked that the shutoff valve is open, but no gas is coming out of that line, regardless of whether connected to the coupler or not. Is the regulator damaged or is there something else I can check?
Just because keg 2 is pouring doesn't mean you still have gas in the tank. If relatively low, the remaining headspace gas can push quite a bit of beer . . . it will slowly become under-carb'ed but beer will flow till the headspace pressure is zero. But troubleshooting is relatively straightforward. First, confirm master valve on CO2 tank is open. I'm guessing you have a sanke coupler, it should have a pressure relief valve on the side. Pull the PRV on keg 2 (the pouring keg) to make sure pressure is being applied (steady HISSS). That confirms gas is in the tank. If yes, then pull it on keg 1 (the bad one) and see if you get the same HISSS. If yes you have a blockage in beer line/faucet. If silence, then back to the shutoff valve (confirm it's closed) and disconnect gas line . . . open valve and there should be a rush of gas. If not, then the reg is AFU (possible but unlikely). Whenever you reconnect a gas line or reg coupling do a leak test with soapy water.
Try engaging the coupler while it is disconnected from the keg. You should get gas flow from both. Make sure the ball check is not stuck. Cheers
