May sound silly, but are the FOB's installed correctly? I was called into a new installation, done by someone else, to troubleshoot the system. The system worked but the FOB's didn't work, lines did not shut down when kegs blew empty. FOB's were installed with the lines switched. We switched the lines and they worked perfectly. If the line from the keg is connected to the "out" nipple, the beer flow is running backwards through the FOB. Good luck.
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