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08-21-2014, 02:20 PM
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#1
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Montana Master
Join Date: Oct 2012
Location: Box Elder
Posts: 4,701
M.O.C. #12947
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A/C problem repaired
A couple of months ago, while in Missouri, we were in our Montana with the front A/C running during a heavy rain and thunderstorm, and the unit started doing weird things, so quickly shut down the thermostat. After things settled down, went to start the A/C again, and nothing. Checked for breaker tripped, it was good. Checked for power at the A/C, and that was good also. The thermostat still worked, operating the rear unit, and there were no fault codes.
After quite a bit of thought, I checked the control box under the unit, which is accessed behind the return filter grill. This is a Dometic CCC II thermostat system using the Multi zone kits at each A/C unit. I removed the box from the front A/C, and opened the cover. What I found was corrosion on the circuit board, apparently from moisture. There has been no leaking, so I assume it is condensation which caused the corrosion.
I ordered a new box, which is part of the Dometic Multi Zone Kit for the CCC II thermostat system. I received the new kit today, maybe 20 minutes to replace with the new box. We now have the front A/C working again.
Just thought this would help with those that have no obvious issues causing their A/C to not work. Less than $100 for the kit, and very easy to replace. Just make sure the 120 volt breaker is off prior to working on this.
__________________
Bob & Becky
2012 3402RL
2012 Chevy 2500HD D/A CC 4WD
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08-21-2014, 03:17 PM
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#2
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Montana Master
Join Date: Feb 2012
Location: Lake Gaston
Posts: 8,773
M.O.C. #12156
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Good info, thanks!
__________________
Mike and Lorraine
2002 3655 FL, 2005 3650RK
2010 3665RE, 2015 3910FB
F350 crew cab dually 6.7
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08-22-2014, 02:45 AM
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#3
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Site Team
Join Date: Jun 2011
Location: Wilsey
Posts: 18,799
M.O.C. #11455
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Good job of diagnosis and repair.
__________________
Dick, Joyce, Diego, Picatso and Gustav
2017 3720 RL, and 2013 HC 343RL
Pullrite Hitch, IS, Disk Brakes, 3rd AC, Winegard Traveler, Bathroom door mod, Dometic 320, couch for desk swap, replaced chairs, sun screens, added awnings, etc.
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