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Old 07-10-2019, 10:38 PM   #1
rvthereyet
2015.5 Unity TB
 
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Default AC cycles over and over?

Help...

My apologies up front... but I can't find the posting(s) that dealt with a "short cycle" issue on our '15 TB Domitic AC unit.

When we first turn it on, it's great for a few hours. It cycles correctly, and things "work".

Then, toward the early hours, the AC comes on for a few minutes (seems like it's only the fan though and not the cooling cycle), then, goes off.

This repeats over and over ever 5-10 minutes.

Is there a master reset of the AC and if so, how do we reset the unit?

If not, is there something else we can do?

Thanks.

--Tom
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Old 07-10-2019, 11:43 PM   #2
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Default Re: AC cycles over and over?

If you have it set on ďautoĒ, itís probably functioning properly. When you say as it gets early, I assume itís been running all night and as the outside temperatures have fallen, the unit is just trying to maintain whatever temperature you have set. Did it work differently in the past?
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Old 07-11-2019, 12:37 AM   #3
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Default Re: AC cycles over and over?

Mine does the same, and it seems like the compressor is not even kicking on for those short cycles. I usually get up and change the temperature a degree or two up or down. Often that stops the cycling or puts it in a more normal mode. Other people have reported that they just change the fan setting to run on low all night (slight risk of freezing up). I think it is a design fault that has existed over the years with no resolution.
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Old 07-11-2019, 12:39 AM   #4
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Default Re: AC cycles over and over?

Time between cycles?
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Old 07-11-2019, 01:08 AM   #5
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Default Re: AC cycles over and over?

Quote:
Originally Posted by Bobnoxious View Post
Time between cycles?
5 to 10 seconds.... maybe 15, but not enough for the compressor to come on.... and this repeats about every minute or two.... on and on. Sometimes I sleep through it, but only after camping for several days (i.e. get used to it).
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Old 07-11-2019, 02:04 PM   #6
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Default Re: AC cycles over and over?

Usually when mine starts cycling it's because the thermostat is seeing to much humidity. See my experience starting with post #6, https://sprinter-source.com/forum/sh...light=Humidity. When I notice the cycling I first check humidity level in the coach and if that looks okay then I lower or raise the thermostat setting by one degree, which usually stops the cycling. Also, if it is very hot outside, the AC cycles because to much heat is coming from windows or walls for the AC to overcome at certain temp settings. When it is 95+ out I use Reflectix in all the windows and skylights and pull my extra Cab curtains down to close off the Cab area to try and reduce the radiant heat factor. That Cab area really gets hot, we use it as a drying room for wet closets because it gets so hot.
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Last edited by SSTraveler; 07-12-2019 at 10:48 AM.
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Old 07-11-2019, 03:31 PM   #7
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Default Re: AC cycles over and over?

We have been happier using the “low” setting for fan speed with temp set where we want. The fan runs continuously but the temperature stays more constant.
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Old 07-11-2019, 03:33 PM   #8
hotfudge
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Default Re: AC cycles over and over?

Make certain your thermostat 'dead band' is set for 2 deg, NOT 1 deg. Also, check to see if one of your ceiling AC vents is blowing directly on the thermostat.
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Old 07-11-2019, 10:02 PM   #9
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Default Re: AC cycles over and over?

I have basically the same “issue” (if it’s an issue), where do you check the “dead band” setting?
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Old 07-11-2019, 11:17 PM   #10
rvthereyet
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Default Re: AC cycles over and over?

+1 for the "dead band" setting question!

:)

--Tom
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