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Old 07-20-2012, 12:15 PM   #1
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DuoTherm AC problem

I have a single,13500, ducted duotherm AC. Up till now it has worked well as expected. The unit is in a 2006 Monaco Monarch SE PDD. Problem is that AC reaches the desired temp and will shut off then usuall in a few seconds come back on. It will continue to cut off and on like this unless I turn unit off. It is cooling fine, capacitors are good, best I can tell sompressor is operating normally. What might cause this short recycle time. Any suggestions or help appreciated.
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Old 07-20-2012, 12:43 PM   #2
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Try setting the temp a little higher or lower and see if it regulates. If it continues shutting on and off at different temps it may well be the thermostat
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Old 07-20-2012, 01:34 PM   #3
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Make sure you do not have the thermostat located where it has cold air blowing on it.

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Old 07-20-2012, 10:55 PM   #4
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if you have the Dometic analog T stat...(white side to side rectangular model) its prob your T stat...mine did same thing last year...T stat fixed the problem
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Old 07-21-2012, 07:37 AM   #5
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Thanks to all. I am trying to locate a replacement T-stat and try that. I will let you know.
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Old 07-21-2012, 05:52 PM   #6
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Could be the thermost......if not, likely the control bosrd. I had the same problem and it was a cold solder joint (intermittent connection) on the board, to the relay that provided power to the compressor. Rook
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Old 07-21-2012, 06:52 PM   #7
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If you have the option, run your AC on High Cool instead of AUTO. That way the fan continues to move the air when the compressor shuts off. Temperature will be controlled more consistently and the short cycling will diminish. This certainly holds true for Coleman units.
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Old 07-27-2012, 01:25 PM   #8
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Well. we were never able to really get the ac problem fully resolved. Got it to work but not like it should. So,I have an appointment with the shop for this coming Monday to get it repaired. Needed a few other things done as well so I suppose it all came at a good time, if there is such a thing. Whatever the outcome, when I know the fix I will post. Thanks to all.
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Old 08-02-2012, 07:01 PM   #9
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Just wanted to post that ac is now functioning as it should. Turned out the control board was the culprit. Thanks to all that replied.
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