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Old 09-21-2013, 10:36 PM   #1
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Exclamation Thermostat not working or AC unit is dead?

I have a 28FT CCD with an ac unit installed about 2 years ago with a brand new thermostat. Everything seemed to be working fine when I noticed the AC unit was not turning on. I looked at the thermostat and it was blank. At first I thought it needed a battery for the thermostat but this it does not use a battery. What would be the proper way to diagnose the problem and how do I get the AC unit running again.

John
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Old 09-22-2013, 12:26 AM   #2
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I found a copy of this post by lewster, it might help you out:


Try re-setting your thermostat first by doing the following:

1. turn off the thermostat (Dometic Comfort Control Center or CCC) at the bottom switch.

2. press in the top and bottom buttons on the CCC and hold them in.

3. turn on the bottom switch. You should see 'FF' in the window and it should be back-lit.

4. count to 5 and release the top and bottom buttons.

5. the CCC should be working normally now.

You did not say if any other functions like the fan/ heat pump (if you have one, which you probably do) of furnace functions are operating. If your fan runs on the 'fan only' setting but the compressor will not engage on A/C, you most likely have a bad start capacitor/PTCR which needs to be replaced before the compressor will operate again.

If it's more than the above, you need to find a factory authorized Dometic Service Center (you don't have to be limited to an Airstream dealer) who can troubleshoot it for you, especially if your CCC is operating properly and your breaker is functioning. I would check the output from the breaker with a volt meter just to be certain that you don't have a bad breaker. I would try re-setting the breaker anyway by flipping it down to the off position and then up again (with the CCC off). Be advised that your warranty will cover parts and labor to FIX the problem, NOT to diagnose it, nor any mobile service charges that you might incur.
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Old 09-22-2013, 06:49 AM   #3
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Before you do anything else, check the 120 volt breakers and 12 volt fuses. After you verify they are okay, you can go from there.
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Old 09-22-2013, 11:06 AM   #4
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Checked the AC and DC fuses. Everything checked out ok. Thermostat had no digital read out whatsoever.
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Old 09-22-2013, 11:56 AM   #5
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Hi John, lets try some easy stuff first. Take the thermostat off the wall and ensure that the telephone like connection is indeed, connected. If it is, then you next have to check and see if the other end is connected. Not so easy. You have to remove the cowling from the inside of the Airstream. Six screws. In my case, I found a kid who had skinny fingers, my kid, and had him mess around with the telephone like connection up in the unit. It was loose. He plugged it back in, and all was fixed. If you now have a read out on your digital thermostat and everything is not working properly, you may have to do a reset as noted previously. A number of us have had to do this and that seemed to fix things. You can find a manual on line if you don't have one. That is the whole extent of my ability to try and help. Hope things work out. Jim
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Old 09-22-2013, 12:23 PM   #6
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Hi Jim,

Last night I removed the Thermostat (CCC) and checked the telephone connection. It seemed fine but still I removed and replaced it just to make sure. The reset mentioned above does not work as the CCC is blank. After turning it off, pressing the upper and lower buttons and turning it back on while holding, it remained blank. This morning I decided to try and check the breaker. In doing so I removed the power cord only to find it was badly charred on the cord and the receptacle side of the Air Stream.

I will try to download a few photos if I'm able to figure out how to do it. I'm comfortable replacing the cord side of the problem but not sure about the Air Stream side. If I were on the road I would take it to a service center. Since it is at home I'm not able to be as flexible. I'm comfortable working with wiring, etc., Used to be an electrician but I'm not and Air Stream expert. Here are a couple of photos if they show up.
/Users/jgeisen/Desktop/IMG_1728.jpg
/Users/jgeisen/Desktop/IMG_1728.jpg

Thanks to everyone for your help.

John
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Old 09-22-2013, 03:46 PM   #7
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Hi John, blank thermostat means it is not getting 12 v power, so it is not related to the 120ac source. Remember that your furnace needs 12v but not 120 to function and it is turned off and on by the thermostat. Since it is not a fuse, and not the attachment at the thermostat, you are going to have to look at the other end of the phone like line. I assume other 12v items are functioning.
I also had a similar burning malfunction on the ac chord when I had two of them joined together and the connection was loose causing some arching. Fixed by ensuring a tight connection. No end to this stuff, seems to come in waves. One must enjoy puttering or he is in for a bad time. Jim
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Old 09-22-2013, 04:43 PM   #8
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Your 12VDC power comes from the upper A/C unit. The 12VDC enters the upper control board via red and black wires. The control board then sends power to your CCC via the phone-type data cable.

Remove the air box on your interior ceiling and you should see the 12VDC power wire connections. Check here first to be sure they have 12VDC. if they are good, the data cable to the CCC will either run directly to the control board or will connect into a plastic RJ-11 union with a phone-type plug on either end. This union could have failed.

Try unplugging and re-plugging both connectors several times to see if you get power to the CCC.

BTW, is the slide switch at the CCC on?
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Old 09-22-2013, 07:05 PM   #9
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Thanks Jim,

Yes, I enjoy tinkering but since I've been working again time is at a premium. I'm pretty sure the AC line is fixable and not that difficult. I'll try the connections on the AC side once I get power back. But it seems maybe I don't need power to test and/or fix the thermostat? All other 12V functions are working fine.

John
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Old 09-22-2013, 07:10 PM   #10
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Hi Lewster,

I will remove the shroud around the AC to see if I can get the thermostat to register. Yes, I've remembered to turn it off and on again for testing. Will the thermostat function without 120V? I realize I need 120 to run the AC but I thought while I was waiting for the alternating current stuff to arrive I could continue to check out the functioning of the thermostat. BTW, what is the possibility that the thermostat itself is is the problem?

John
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Old 09-22-2013, 09:54 PM   #11
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John

Last year I had the same problem (Blank thermostat) therfore no AC or heat. After searching in the forums everything pointed to a fuse on the air conditioner circuit board.. So being the practical guy that I am, I took the interior shroud off to access the fuse... No fuse!!! The "rocket scientists" that designed the air conditioner put the fuse that is only accessible from the top of the trailer, not the interior which make sense..I had to reach over while on a ladder to take the exterior shroud off, to access the circuit board and the fuse.. After I replaced the fuse the thermostat had power again.. maybe this is your problem.. I hope it helps

Paul
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Old 09-29-2013, 07:19 AM   #12
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Hi Paul,

I managed to get up on the roof yesterday and checked the 3 amp fuse on the control board. It was fine but still no working thermostat. I also need to figure out if I have 110v somewhere on the unit. Once I've done that I will pull the shroud on the air handler today and bypass the wiring to see if I can get it to display. If not, I think I've exhausted the list of recommendations by the forum. I may need to take the thermostat somewhere to have it checked. Thanks to everyone for your support and ideas.
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Old 09-29-2013, 09:34 AM   #13
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John,


Simply checking the 3A fuse does not tell you if there is 12VDC power to the unit. You will not get anything on the T/stat screen without it. You must locate the red and black wires coming from the board in the wire harness and be certain that 12VDC is present there.
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Old 09-29-2013, 11:09 AM   #14
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Hi Lewster,

Thanks. Where is the easiest place to check for the 12VDC? I'd rather not get back on the roof if possible. Is there a place at the 12 volt fuse box or perhaps under the shroud? Thanks again. -John
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