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Old 05-08-2014, 05:09 PM   #1
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Dometic AC

Another question about our new trailer. When it starts to heat up outside(right now it is 91 and full sun) the AC will turn off and on. Seems to be cycling and the speed changes. It is still cooling, but the off and on thing doesn't seem normal. It will do this every few minutes. Any ideas will help me understand.
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Old 05-08-2014, 05:11 PM   #2
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Most likely defrosting is my guess.

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Old 05-08-2014, 05:17 PM   #3
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Thanks f1100turbo
If it is defrosting would this mean it is low on freon?
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Old 05-08-2014, 05:27 PM   #4
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Not necessarily.
It could be hot and humid enough that the lower coils are frosting up.
Try a little warmer setting .
20 degrees difference between inside to outside is about max.

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Old 05-08-2014, 05:32 PM   #5
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It is set on 80 and 91 out side. Where we are sitting the sun will be off the trailer in about an hour and it will stop the cycling.
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Old 05-08-2014, 05:32 PM   #6
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Quote:
Originally Posted by ronconp View Post
Another question about our new trailer. When it starts to heat up outside(right now it is 91 and full sun) the AC will turn off and on. Seems to be cycling and the speed changes. It is still cooling, but the off and on thing doesn't seem normal. It will do this every few minutes. Any ideas will help me understand.
I believe that is explained in the manual for your thermostat. Mine does that also and has been since we bought our trailer in March 2012.
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Old 05-08-2014, 05:36 PM   #7
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Thanks Oakman
I'll check out the thermostat manual.
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Old 05-09-2014, 09:02 AM   #8
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I never noticed that with my dometic a/c on my Lacrosse.
Just a question, you dont have a vent or window open slightly? I think that can make it frost up a bit.

Wish I had a 2nd a/c in my unit. One unit works hard to keep up on hot days with no shade.
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Old 05-09-2014, 09:19 AM   #9
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If the condenser on the Ac creates a lot of frost it won't work properly this usually happens when there is high humidity. I had this happen on a car once I just shut it off for 10 to 15 minutes so it thawed then turned it back on and it worked fine for the rest of trip.
It's kind of like defrosting your refrigerator when you do it works more efficient.
What you have described sounds like what I had happen but there could be other things.
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Old 05-09-2014, 09:34 AM   #10
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The on off thing sucks, but is normal. That's just how the new control box / thermostat works. It decides what speed it wants when in auto, depending on the temp. The older ones had a smooth transition between speeds. First time I dealt with the newer ones on our Forester, I thought something was wrong with it, until I went in several other campers with the same set up. If it's too annoying, just put it on high fan and let it go.
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