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Old 05-31-2011, 05:17 AM   #1
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No rear AC - 2005 Am. Tradition

I have a 05 Tradition 42r with three air conditioners, I noticed the rear AC when set to auto cool will not do anything. When set to fan only it runs fine. Already checked the breaker and it is not tripped. Any suggestions?
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Old 05-31-2011, 11:23 AM   #2
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336muffin,

Try the rear a/c on gennerator power and let us know what happens.


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Old 05-31-2011, 04:40 PM   #3
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Good call but already tried that, no difference. Also flipped all the breakers off and back on one at a time just in case they might have been labeled wrong. Fan works when I set it to fan only. When the AC is set to auto.....nothing. Thanks for the advice though! Is there a reset button or another breaker up top?
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Old 05-31-2011, 06:17 PM   #4
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No Rear A/C 2005 American Coach Tradition

336muffin,

Can you retitle this to the above?
It may help get you more responses.


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Old 05-31-2011, 06:46 PM   #5
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You may have an energy mangement system that is shutting it down

With 3 A/C's I'd want one.
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Old 06-01-2011, 08:46 AM   #6
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wa8yxm you are correct! On further checking I found out that I had several other items not working! It is the EMS that is causing the problems, is there any way to diagnose and find what is the problem?
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Old 06-03-2011, 09:59 AM   #7
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I have a simular problem with both the front and rear air conditioners on my 2002 Country Coach. Have you found a solution to this problem. So far, I have had two supposedly qualified RV Techs to check my problem with no success. mlhjr1
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Old 06-03-2011, 10:10 AM   #8
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The EMS may have a Test switch on it.

EMS different Manuals Here for Troubleshooting
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Old 06-03-2011, 01:08 PM   #9
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The first thing to try with a flaky EMS is to remove 12v power from it to force a reset. Try using your house battery disconnect - that usually does it on American Coach products. If not, you will have to pull the access panel off and remove the 12v hot wire.

Why are you sure it's the EMS? If several 120v things are off, you might have lost one "leg" of your 50A power.
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Old 06-04-2011, 02:30 AM   #10
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The board is supposedly bad, lost everything except the front two AC's. All plugs, water heater, fridge,rear AC are not working. Only lights lit on EMS are the two AC's. I disconnected the 12 volt plug on the back of the panel with no change in system. Thanks for all the reply's. I'll give a update possibly Tuesday when the board arrives.
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