HELP!! Dometic CCC2 Issue

If you have 3 roof units, then zone 1, there is NO DIP switch setting. The DIP switches are set for Zone 2 and Zone 3. Those DIP switches are set on The Zone 2 AC board and the Zone 3 AC board. You need to verify WHERE your tstat 12 volt power comes from. It can come from any of the 3 Zones at the upper control board. There will be a Black and Red low voltage wire at the connections for each AC unit. Only ONE of the 12 volts needs connected. The other 2 Zones get their 12 volt power from that one connection and also the wall CCC2. Usually, the Zones are set up FRONT of RV to Rear. Front is Zone 1, Middle is Zone 2 and Rear is Zone 3. But it appears yours was wired with the middle as Zone 1? NOT a big deal but can be confusing when trying to determine which AC is on what Zone. From your post it appears the middle is the Zone 1? Correct? Since the wall CCC is functioning that seems to indicate the middle Zone 1 is NOT the main controller AC. Either 2 or 3 is the controller. There is a COMM wire that looks like a phone cable that goes between all 3 AC units and then a cable from one of the units down to the wall CCC. Make sure the 4 wire connectors do not have ANY corrosion. Also, do you have Penguin model units? 600 series? Doug