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06-12-2016, 11:27 AM
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#1
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1 Rivet Member
2014 27' FB International
Irving
, Texas
Join Date: Feb 2013
Posts: 8
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Two A/C units - Why one thermostat?
We have a 2014 27FB with two Dometic A/C units and one thermostat. When one A/C has a problem, they both go down. This has happened twice. Not fun when it's 100 degrees. Can I isolate the A/C units, each having its own thermostat. This makes better sense to me.
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06-12-2016, 12:32 PM
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#2
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4 Rivet Member
Durango
, Colorado
Join Date: Jan 2014
Posts: 426
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Quote:
Originally Posted by jrschro
We have a 2014 27FB with two Dometic A/C units and one thermostat. When one A/C has a problem, they both go down. This has happened twice. Not fun when it's 100 degrees. Can I isolate the A/C units, each having its own thermostat. This makes better sense to me.
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Not sure what you mean by when one has a problem they both go down.
They should be zoned with with their own separate temp controls. I have one thermostat too, but it has a zone 1 and zone 2. I can set each zone for A/C on off, one at a time, both on at once, heat in one A/C in another. Fan on auto, off, high, med, low for each separate zone.
Granted the thermostat is complicated and that the temp sensor isn't very accurate. But they both should work independently.
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06-12-2016, 01:17 PM
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#3
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Rivet Master
2014 20' Flying Cloud
Sag Harbor
, New York
Join Date: Jun 2015
Posts: 17,523
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Welcome to the forum! Sorry for the conditions you are having to endure.
See the recent comments on the following thread about re-booting the thermostat:
http://www.airforums.com/forums/f427...ld-151393.html
Just a wild guess on my part, but you might consider going through the relatively easy steps of this reset, to see if it helps.
You could also bounce up a level here, and check the various topics posted on this sub-forum:
http://www.airforums.com/forums/f427/
There may be other helpful threads.
Good luck,
Peter
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06-12-2016, 01:33 PM
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#4
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Rivet Master
1972 31' Sovereign
1975 31' Excella 500
Currently Looking...
Benton
, Arkansas
Join Date: Mar 2013
Posts: 5,868
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I am with the OP.
Why not just a simple thermostat in each zone?
Sometimes the more simple solution is best imho.
Superat stultitia.
__________________
The fact that I am opinionated does not presuppose that I am wrong......
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06-12-2016, 03:17 PM
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#5
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Rivet Master
2005 39' Land Yacht 390 XL 396
Common Sense
, Texas
Join Date: Sep 2007
Posts: 5,319
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If you dig into it far enough with the manufacturer, you will find out what you are calling a thermostat is really a control computer. Each A/C unit has it's own actual thermostat built into the PC board, and the computer just tell it what temp to work at.
And you can actually disable the thermostat in the board, and work on the computer's thermostat by disconnecting the white wire on the A/C unit's board, but don't do more than one of them, usually the front one closest to the computer.
I don't like the system either, but it is what it is, and was actually designed as a "bells and whistles" feature for the "discriminating" owner.....something expensive to replace when it goes bad.
__________________
Regards,
Steve
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06-12-2016, 03:32 PM
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#6
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Retired.
Currently Looking...
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, At Large
Join Date: Jun 2003
Posts: 21,276
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The climate control computer has a separate sensor for the second a/c, usually somewhere near the second unit. The first unit uses the internal thermostat of the CCC to control it.
__________________
Meddle not in the affairs of dragons, for you are crunchy, and taste good with ketchup.
Terry
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06-13-2016, 03:32 AM
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#7
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Rivet Master
2014 20' Flying Cloud
Sag Harbor
, New York
Join Date: Jun 2015
Posts: 17,523
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Quote:
Originally Posted by jrschro
We have a 2014 27FB with two Dometic A/C units and one thermostat. When one A/C has a problem, they both go down. This has happened twice. Not fun when it's 100 degrees. Can I isolate the A/C units, each having its own thermostat. This makes better sense to me.
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Wondering if you tried resetting the thermostat per the earlier comment?
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06-13-2016, 05:05 AM
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#8
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Rivet Master
2005 39' Land Yacht 390 XL 396
Common Sense
, Texas
Join Date: Sep 2007
Posts: 5,319
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Quote:
Originally Posted by overlander63
The climate control computer has a separate sensor for the second a/c, usually somewhere near the second unit. The first unit uses the internal thermostat of the CCC to control it.
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This is true but only if the thermostat on the first unit's board is disconnected.
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06-13-2016, 09:59 AM
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#9
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1 Rivet Member
2014 27' FB International
Irving
, Texas
Join Date: Feb 2013
Posts: 8
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E1 Error
Thanks for the information. Both times the AC went out we had an E1 error on the control computer. We tried to initialize and reset the control computer and disconnect the wire. With the E1 error both AC would not work. The first time we had to have a technician reprogram the control computer. The second time we had to replace the circuit board on the number 2 AC. I guess I need to learn how to work on these things myself. They alway go out on Sunday when its 100 degrees.
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06-13-2016, 08:31 PM
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#10
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2 Rivet Member
2016 28' Pendleton
Cybertron
, Illinois
Join Date: Mar 2016
Posts: 57
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Maybe your 50amp service is not maintaining the necessary voltage. Have you verified your power is good?
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