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Old 07-26-2019, 08:51 PM   #1
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AC won't turn back on

So I just bought a brand new Sabre 5th wheel. The A\C is blowing nice and cold for a while then shuts off. As as the temp goes up inside the camper you'd expect the unit to kick back on but it won't. The only way I can get it to turn back on is if I set the thermostat to off, wait a few seconds, then go back to cool. Both the front and rear A/C units are doing the same thing. Any ideas?

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Old 07-26-2019, 09:05 PM   #2
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Welcome to the forum from New Jersey, Just got back from Delaware, Try taking the AC off auto, run on either low or hi, This should keep the fan running while the compressor cycles on/off.

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Old 07-26-2019, 10:37 PM   #3
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In my experience, you have a bad thermostat. If it's an analog, replace it with a digital (even if it's not bad).
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Old 07-27-2019, 06:53 AM   #4
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If you have a Dometic single zone thermostat, you can try initializing it. That works sometimes, but other times it's as Roo said, the thermostat is defective.
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Old 08-06-2019, 12:23 AM   #5
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This is a known issue with some dometic ac's.

It happens so often dometic does even require a repair sheet. They recommend installing their "repair it" which includes a new control box, thermostat, and for some odd reason new a/c mounting bolts.

Side note: If anyone has issues with their capacitive touch tstats, its the same thing, no questions asked, dometic will send you a new face plate for the tstat.
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Old 08-06-2019, 08:46 AM   #6
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Maybe a related question.... Can the T-stat be set to fan only with no heat or ac?

Mine has 4 mode stops along the menu path. Hit the left MODE and it goes from OFF to FAN (Low/Auto/High), HEAT and COOL. It seems that I touch the mode button to select the fan mode, and that is selecting the fan mode for the heat or cool mode. It does not seem to have a stand alone fan to circulate air.

I really wish that the AC or furnace had a fan/vent to exhaust hot air out and pull cooler outside air in as the evening arrives. Am I missing something, or is that not an option on these systems?
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Old 08-08-2019, 03:41 AM   #7
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Depends on the unit. Mine allows Fan, HI Cool, LOW Cool and HEAT.

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