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Old 02-07-2020, 07:57 PM   #1
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2016 Interstate Grand Tour Ext
escondido , California
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Dead CCC2 Thermostat

I have a 2016 GT Ext with the extra wardrobe cabinet (the CCC2 is attached to the outside wall of the wardrobe). I went to turn the heat on and the thermostat briefly powered up then went blank. Has been dead since. I re-terminated the control cable in case it got trashed from loading too many clothes in the wardrobe but that did not fix the problem. It is possible that the connector to the back of the TS got damaged but can't confirm that.

This is the second time this TS has been replaced. The dealer replaced when I purchased in 2018. They may have also replaced the control box but can't confirm since I do not have the paper work. Anyway, a new one is about $100 but before I pull the trigger on this, I am wondering if others have experienced this problem.
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Old 02-08-2020, 04:37 AM   #2
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2016 Interstate Grand Tour Ext
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There is a 5 amp inline fuse that supplies power to the tstat. It is behind a panel next to the furnace. You will have to remove your table top from the stowed posistion on the wall to get access.
The fuse on mine blew when the heat was trying to start. I looked and found the fuse on wiring diagram but couldn't see a way to access it. I never use the table top so I didn't remember the panel being behind there. Someone ? On this forum reminded me of the panel.
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Old 02-08-2020, 05:41 AM   #3
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Good to know about the fuse. Anybody know where it is located on a 2013 Lounge EXT? My wiring diagram shows it being in the furnace itself, but your info. seems to suggest otherwise. I didn't see it when I removed the snap-on cover on the front of the furnace, and did not dig any deeper than that.
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Old 02-08-2020, 05:21 PM   #4
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escondido , California
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Here is a picture of the fuse located behind the access panel that is hidden by the stowed table top. Unfortunately, the fuse was not the problem. I am ordering a replacement CCC2 today and will report after I have a chance to install and test. Thanks for the replies.

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Old 02-17-2020, 08:02 PM   #5
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2016 Interstate Grand Tour Ext
escondido , California
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On to the control box?

My new CCC2 thermostat arrived but it did not fix the issue. I needed a new one anyway since I destroyed the old one during disassembly, my bad. I confirmed that I have no signals at the RJ jack. Anyway I now suspect the control box but do not know where it is located. The Dometic website is not helpful, nor were they responsive when I contacted them. Has anyone replace this module and can guide me on how to access this? I suspect that I will have to get on the roof and remove the cover to the A/C. Any guidance on how to T/S this?

Thanks for help
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Old 02-17-2020, 08:23 PM   #6
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2018 Interstate Grand Tour Ext
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If it is blank, I would check to confirm that I have +12 and ground on the two outer pins on the telephone cable. That's what powers the thermostat.

You can remove the filter from the AC and see the upper termination of the telephone cable. That could have come undone.
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Old 02-19-2020, 05:58 PM   #7
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escondido , California
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Thank you, I will add this to my T/S checklist. The coach is not available for a couple of weeks so this will have to wait.
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Old 03-17-2020, 08:37 PM   #8
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escondido , California
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Bad Cable

After a bunch of troubleshooting the issue was a bad communications cable. I tried re terminating both ends but this still did not fix the issue. I could not easily remove the entire cable so I added a new one that I fabricated. Oddly, the terminations on the one I made were good, so I can only conclude that there is a break somewhere along the old cable buried in the wire loom. I cut off both ends as far back as I could and left the rest.
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