Originally Posted by birdhunter
So it's 100° I go out plugged into short power leaving both my 15K dometics going. I come back an hour and a half later and the rear zone number two is gone from the remote screen and the air conditioner is not running. I reset the five button remote only one zone zone one comes up. No breakers have flipped. Is this the remote? Or is this the board in one of the roof AC units? If so which one? Yes I checked the phone plugs at the rear AC unit they're fine.
If you still have 120 vac at the rear A/C, here is how I solved the problem.
Of course you have the newer 5 button control station so your setup is different but here are some things to check.
Each control card in the A/C unit has a fuse in the 12 vdc circuit. To get to it you have to take the inlet panel off. Since you said the phone plugs are good you have already removed the panel.
In my case, there was 12 vdc at the front A/C unit and not at the back. Therefore zone 2 was 'gone' from the control station.