No Power to the Dometic 10 button CCC

[newmarokie]

First, my air conditioners are not working! I have done all the resets, but my CCC is not lighting up. The fuse in the mid bath marked HVAC controls is good. Is there another fuse I need to locate before I go into captain destructo mode?

 

[Neal]

Try powering off the salesman switch at the door for a minute, then back on. I realize the AC's require 120V (short power) but something with your T-STAT sounds like an issue. You can also try taking it off the wall, disconnect/reconnect it. I don't know if yours goes through KiB or something else that could be an issue in the line.

 

[TheLooks]

There are a couple of things that can be. If you have the original manuals for it look thru the instructions. It needs 12v to operate so low voltage (blade) fuses. Don't trust looking at a fuse, and don't trust the led lights in the fuse box. Find the fuse and pull it and visually inspect and ohm it out. The problem can be in the thermostat or the control box up in the AC unit. It will most likely require a multimeter to track down the error.

 

[TheLooks]

See this, but it doesn't tell you where the 12v supply comes from.
General Troubleshooting: If the display is blank, check the 12V DC fuse in your RV’s fuse panel and ensure the converter is on or batteries are charged. For unresponsive controls, perform a soft reset by turning the thermostat off, waiting 10 seconds, and turning it back on. If buttons are physically stuck or unresponsive, clean the internal contacts with spray contact cleaner or replace the switch assembly.