CCC thermostat

[aamalle]

2007 newmar kountry star....the thermostat doesn't display zone 1....zone 2 (rear unit) works fine....when switch to zone 1...it comes on for a second then goes blank......comfort control center part no. 3109228.001.....do i need a new thermostat???....or something wrong with wires???
THANKS Bill

[RV Wizard]

You may want to check out this Troubleshooting pdf http://www.irv2.com/forums/downloads.php?do=file&id=36

[aamalle]

How do I remove the ccc thermostatic cover???? need Help!!!!

[MSHappyCampers]

Try the reset procedure below.


Turn off the thermostat with the slide switch underneath

Press and hold the "Mode" and "Zone" buttons at the same time

Turn the power switch back on while still holding the buttons down

Wait about 5 seconds, then release the buttons.



Good luck, happy trails, and God bless!

[aamalle]

I did the reset procedure.....now zone 1 doesn't show up at all.....only zone 2....zone 2 . works good... still need some help....what now?

[MSHappyCampers]

Originally Posted by aamalle

I did the reset procedure.....now zone 1 doesn't show up at all.....only zone 2....zone 2 . works good... still need some help....what now?

The next step would be to check the communications cables from the thermostat to each A/C. This will be a telephone-type flat 4-conductor cable with modular plugs, just like your home telephone would have. The cable plugs into the back of the thermostat, runs to one of the A/C, then another cable will run between the two A/C's. There will probably be some couplers in the lines that join two cables together. These should be accessible from inside be opening the filter grill cover on the ceiling. If the thermostat is in the bedroom like mine, the cables will probably run from the thermostat to the bedroom A/C, then another cable between the two A/C's. The plug behind the thermostat is probably OK, since the Zone 2 unit is working fine.

These modular connectors can become corroded and cause problems like you are having. Just unplug and plug each connector in several times to clean the contacts. When you unplug each one, look at the contacts. They should be gold color and shiny. If you find one that is badly corroded, you will probably need to get someone who has a special crimping tool that can replace the modular plug. If so, the modular jack that it is plugged into may also have to be replaced.

Try the connections visible from inside first. If that doesn't work you will need to get on the roof and remove the shrouds from the A/C's, remove the metal cover over the control boards, and check the contacts there. Start with Zone 1, the front A/C that is not showing on the thermostat.

[aamalle]

Originally Posted by MSHappyCampers

The next step would be to check the communications cables from the thermostat to each A/C. This will be a telephone-type flat 4-conductor cable with modular plugs, just like your home telephone would have. The cable plugs into the back of the thermostat, runs to one of the A/C, then another cable will run between the two A/C's. There will probably be some couplers in the lines that join two cables together. These should be accessible from inside be opening the filter grill cover on the ceiling. If the thermostat is in the bedroom like mine, the cables will probably run from the thermostat to the bedroom A/C, then another cable between the two A/C's. The plug behind the thermostat is probably OK, since the Zone 2 unit is working fine.

These modular connectors can become corroded and cause problems like you are having. Just unplug and plug each connector in several times to clean the contacts. When you unplug each one, look at the contacts. They should be gold color and shiny. If you find one that is badly corroded, you will probably need to get someone who has a special crimping tool that can replace the modular plug. If so, the modular jack that it is plugged into may also have to be replaced.

Try the connections visible from inside first. If that doesn't work you will need to get on the roof and remove the shrouds from the A/C's, remove the metal cover over the control boards, and check the contacts there. Start with Zone 1, the front A/C that is not showing on the thermostat.

Thanks Joe.....Raining here in Maryland today....Will try this tomorrow.....Great information....Thanks a lot.

[MSHappyCampers]

You're welcome! Hope that works for you!

[Darrel]

Bill, When you get the cover off of the front AC you will find a row of dip switches on the passenger side of the AC unit. It probably wouldn't hurt to move them up and down a couple of times in case of dirty contacts. Electric circuit cleaner is also useful.

Have a nice day - Darrel

PS I like your choice of RV

[aamalle]

Thanks.....will try this too....not a good day In Maryland...too windy and rain coming...Thanks again...

[MSHappyCampers]

Originally Posted by Darrel

Bill, When you get the cover off of the front AC you will find a row of dip switches on the passenger side of the AC unit. It probably wouldn't hurt to move them up and down a couple of times in case of dirty contacts. Electric circuit cleaner is also useful.

Have a nice day - Darrel

PS I like your choice of RV

I think I would turn off all power to the A/C's (breakers & slide switch under the thermostat) before doing the dip switch thingy! JMHO!

[FLSteve]

Originally Posted by Darrel

Bill, When you get the cover off of the front AC you will find a row of dip switches on the passenger side of the AC unit. It probably wouldn't hurt to move them up and down a couple of times in case of dirty contacts. Electric circuit cleaner is also useful.

Bill ... here is a picture of what they look like.

Steve

[shiggs68]

Originally Posted by FLSteve

Bill ... here is a picture of what they look like.

Steve

Steve, the picture you have posted is your Zone 2 Air Conditioner. Does your thermostat connect here and then loop to the Zone 1 unit or is it the other way? At any rate, check the connection between the two.

Here is the link to the manual http://www.dometic.com/QBankFiles3/E...nual_17586.pdf

And the correct reset procedure


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[FLSteve]

shiggs68 ... you are correct, that was the back AC (zone 2). Guess you could tell that by the DIP settings with the 2 switch being "on". The thermostat wire first goes to the front AC (zone 1) and then leaves there and goes to the back AC.

I was just posting the picture so the OP could see what DIP switches looked like.

Steve