Going backwards on my A/C problem

[jwm4007]

I have a 2008 Monaco Camelot 43 PDQ with three A/C units. Zone three was not coming up on the wall control unit. Through discussions I made a temporary wire to go from A/C 2 to A/C three and zone three started working again. Got home from the road trip and yesterday decided to try to snake the new wire overhead. I turned on the wall thermostat and now none of the zones are showing and nothing is working. I have the inside covers off all three units and it appears the cable from the wall thermostat goes to A/C unit one, a wire goes from A/C one to A/C two, and from two to three (the one I originally diagnosed as not working). The strange thing is the center A/C unit (2) is different than one and three. Unit 2 is the only one that has a cover over a box that has a 3 amp fuse in it. Units 1 and 3 do NOT have fuses. I have a diagnostic write up that I found on a link suggested here on this forum and it mentions that the thermostat needs 12V DC to operate. I don't see where the 12V comes from and don't see any fuses anywhere except in unit2 and that fuse is OK. I am pulling out what little hair I have left. Any suggestions on where to go from here would be greatly appreciated. Sincerely, Jim Moody

[Steve Ownby]

Jim,

There should also be a fuse in the house 12 VDC fuse block that is often in the closet but could be most anywhere. I'm sure you know where yours is. Mine is labeled for A/C controllers. If you get the power back up, try to reset the thermostat.

1. Turn power slide switch to off.
2. Press both the zone and mode buttons and hold them down.
3. While holding the buttons down, slide the power switch to on.
4. Release the buttons.

[deaton]

I have the same coach

I also have the schematics for the roof air

Pm me an email address and I'll send you back the PDF.