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Old 07-17-2015, 10:42 AM   #11
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When I first posted this question I hadn't paid close enough attention to the duration between short cycles. It seemed like it was 5+ mins maybe. But the next time it started doing it my wife used her phone to time it. The time between short cycles was between 1 min 07 seconds and 1 min 40 seconds.

That's the air conditioner stopping to a full-stop every min and restarting and doing it over and over and over again. And, while the fan is most noticeable when it stops it's also true that the compressor is kicking in on the restart 1 second later.

I can understand that the unit could freeze up - and shut down to thaw the coils. But why would it only stay stopped for a second or two before restarting. So, I don't see how it could be that.

I can also understand that if a vent is blowing on the thermostat that it could prematurely tell the A/C to stop. But, I don't see how it could do this once per minute for 90 mins.

Plus, neither the freezing nor the vent blowing on the thermostat would explain why the problem goes away when the unit is set to LO or HI.

It must be that either the thermostat on the wall has a problem or the control unit in the A/C has a problem.
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Old 07-17-2015, 06:22 PM   #12
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I dug this old topic on this discussion from an earlier post where we discussed the same thing.


Dometic rooftop AC "Short Cycling"
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Old 07-17-2015, 06:23 PM   #13
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1. Agree that it is a good idea not to have any of your A/C vents directed at the thermostat.
2. If compressor and fan are cycling a lot, make sure you haven't set the one degree (vs 2 degree) differential on the thermostat. This will drive you crazy.
3. If the fan stops momentarily but the compressor quietly continues to run, this is how the fan changes speed (moronic as it that is!) and is normal.

I'd love to find an alternative to the Dometic digital thermostat, but the interface appears proprietary.
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