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Old 02-08-2017, 04:30 PM   #1
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AC kicks off and on

New AC domtec 1 yr old.the trailer is
Old trailer & thermostat yr 2002
Set @ 70 it cycles every few seconds
Have to set it on 50 so it won't do that
Do I need a new thermostat?
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Old 02-08-2017, 04:41 PM   #2
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It is certainly possible the thermostat is bad.
Are you able to remove the thermostat and check wiring and possibly hook the wires together to call for constant cooling to see what happens?

I'm not sure what you are referring to that is cycling every few seconds?

The fan possibly could do that but the compressor has a time delay built in that would prevent it from doing that. Does the unit cool at all?
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Old 02-08-2017, 04:44 PM   #3
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The newer Dometic use an electronic thermostat. You may not have the correct one. Check your manual or call tech support. Amazon sells them.
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Old 02-08-2017, 07:32 PM   #4
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Mine does the same. If I set the fan setting from AU to either Hi or Lo it never turns off. On the Hi fan setting I can hear the compressed kick on then turn off when the proper temp is reached but the fan continues to run, as it should.on the AU setting when the fan kicks off the compressor will continue to run unless the set temp. is reached. I think the thermostat is at fault.
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Old 02-08-2017, 08:16 PM   #5
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I had the same problem on my Rockwood 2604WS. It was caused by the venting output pointing toward the thermostat. Once I adjusted that the issue went away.
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Old 02-08-2017, 09:21 PM   #6
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Shouldn't the compressor shut down first then the blower a few seconds later?
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Old 02-09-2017, 04:49 PM   #7
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I had the same problem on my Rockwood 2604WS. It was caused by the venting output pointing toward the thermostat. Once I adjusted that the issue went away.
+1 It drove me crazy until I adjusted the vents so that they wouldn't cool the thermostat and the A/C was more evenly distributed
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Old 02-09-2017, 07:35 PM   #8
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Quote:
Originally Posted by BuckeyeChuck View Post
Shouldn't the compressor shut down first then the blower a few seconds later?
Yes
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Old 02-10-2017, 12:28 PM   #9
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Dometic AC Re-Cycling

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Originally Posted by Louisiana Irishman View Post
New AC domtec 1 yr old.the trailer is
Old trailer & thermostat yr 2002
Set @ 70 it cycles every few seconds
Have to set it on 50 so it won't do that
Do I need a new thermostat?
Your condition sounds like it might be due to a too-tight temperature range setting in the thermostat.

However, I would like to mention that both the Dometic ACs in my Georgetown experience frequent fan cycling. In other words, the fan turns off for a few seconds and then turns back on. I don't think the compressors do this because I think I can hear them continue to run. Also, you would think they would bind up without a time delay to all the Freon pressure to bleed down. This only occurs at certain times like when I first turn on the ACs to get the cabin cooled down. I can not imagine why the fans do this but it has been this way since the rig was new. I try to just ignore it even though it concerns me.
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Old 02-10-2017, 01:21 PM   #10
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Your condition sounds like it might be due to a too-tight temperature range setting in the thermostat.

However, I would like to mention that both the Dometic ACs in my Georgetown experience frequent fan cycling. In other words, the fan turns off for a few seconds and then turns back on. I don't think the compressors do this because I think I can hear them continue to run. Also, you would think they would bind up without a time delay to all the Freon pressure to bleed down. This only occurs at certain times like when I first turn on the ACs to get the cabin cooled down. I can not imagine why the fans do this but it has been this way since the rig was new. I try to just ignore it even though it concerns me.
Mine does similar starts and stop and it concerns me too! I suspect the thermostat but haven't confirmed it.
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Old 02-10-2017, 01:25 PM   #11
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Quote:
Originally Posted by hikerjohn7 View Post
Your condition sounds like it might be due to a too-tight temperature range setting in the thermostat.

However, I would like to mention that both the Dometic ACs in my Georgetown experience frequent fan cycling. In other words, the fan turns off for a few seconds and then turns back on. I don't think the compressors do this because I think I can hear them continue to run. Also, you would think they would bind up without a time delay to all the Freon pressure to bleed down. This only occurs at certain times like when I first turn on the ACs to get the cabin cooled down. I can not imagine why the fans do this but it has been this way since the rig was new. I try to just ignore it even though it concerns me.
Exactly like what happens to mine. Also been doing it since new (2013).
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Old 02-10-2017, 02:33 PM   #12
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Fan Cycling

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Originally Posted by CedarCreekWoody View Post
Mine does similar starts and stop and it concerns me too! I suspect the thermostat but haven't confirmed it.
Considering the thermostat controls the AC's components, that makes sense. As long as the compressor is not cycling, it should not be doing any damage but it's still not acceptable. And a vent blowing on the thermostat should not be the cause for the fan to shut off since the compressor stops first when the set temp is reached.

I got a feeling this fan behavior is common on the Dometic ACs but I am surprised that more is not posted it on it. I wonder if Forest River or Dometic ever read these posts.
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Old 02-12-2017, 03:28 PM   #13
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It is hard to tell on mine, but when the fan shuts down, it is switching from high speed to low and and back. On mine when the temp gets close to the set point the fan will switch to low. If to cools enough it will turn off, but usually it will kick back to high as the sun keeps warming the trailer. We will see the switching in the early morning and evening as the sun will keep things hot during the day and it will run full bore.
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Old 02-12-2017, 09:32 PM   #14
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AC kicks off and on

New dometic single zone thermostat, set in auto and a 2 degree + temperature, the fan will shut down and change to high to compensate and return to low. The compressor will continue to run while the fan shuts down for a few seconds. I just switch to high fan until the a/c can keep the temperature close to thermostat setting.
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Old 02-13-2017, 08:30 AM   #15
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Thanks for the Replies. I'm now convinced that the fan cycling is caused by the thermostat.
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Old 02-13-2017, 08:53 AM   #16
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The fan will pause when automatically switching from high to low and vice versa
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Old 02-13-2017, 08:55 AM   #17
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Thanks for the Replies. I'm now convinced that the fan cycling is caused by the thermostat.
I agree with you, it is the thermostat. Are you replacing yours. If so please let us know how it goes. I just re-initialize mine but won't really know if that worked until hot weather arrives.
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Old 02-13-2017, 09:29 AM   #18
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I have an identical thermostat in the bedroom that is not in use. I may switch them but I'll probably just live with it as is. I can always switch the fan from AU to either HI or LO and then it won't cycle on and off.
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Old 02-13-2017, 09:56 AM   #19
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Well then let us know how that works out. Considering the times mine has malfunctioned I'm not convinced that is my problem. I would like to know how this works out for you.
I think I see a replacement thermostat in my future...
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Old 02-15-2017, 07:53 AM   #20
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I'll probably continue to live with problem but if I decide to swap them out I'll post the results.
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