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Old 08-03-2016, 04:40 PM   #1
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Thermostat Issues With Dometic Air Conditioner

I have a 2016 27HFS Hyper Lite that has a Dometic single zone LCD thermostat. The thermostat seems to work intermittently with the temperature set point. When I go to bed at night I'll set the temp to 60 degrees. Sometimes I'll wake up in the middle of the night because I'm hot and I'll find the A/C is not on. The temp is still set to 60 in the thermostat but it is not kicking the A/C on. If I turn the thermostat off and turn it back on the A/C will come on. This does not happen every night but it has happened a few times now. Any ideas? I looked in the manual but this was not covered in troubleshooting. Thanks
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Old 08-04-2016, 09:53 AM   #2
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Have you tried to initialize the thermostat? If not, I'd suggest you try that. It's worked for a few people.

If that doesn't work you will most likely have to have it or the control box replaced.
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Old 08-04-2016, 10:17 AM   #3
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I have not done anything with the thermostat. I'll do some searching and see if I can find what initializing the thermostat entails.

Update: I found the initialization process in the manual. I'll give that a try and turn it on and see what that does. This morning it was set to 61 degrees and when I woke up it was 71 inside.
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Old 08-04-2016, 10:39 AM   #4
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Please let us know if the re-initialization works for you.
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Old 08-04-2016, 01:29 PM   #5
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60 is really low for AC. Perhaps the AC is freezing up or the outside temperature is below the point at which many AC's shut off.
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Old 08-04-2016, 06:44 PM   #6
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I recently had a Dometic LCD thermostat installed in my motorhome. I had a similar problem where the unit kept losing communication with the AC units and shutting down. The cause was hot air in the wall cavity meeting the cold air inside. The result was moisture forming on the thermostat PC board. I put Window and Door spray insulation in the wall cavity and a thin piece of foam between the back of the thermostat and the wall. Problem solved. Don't know if yours is the same, but it is something the check.
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Old 08-06-2016, 01:16 PM   #7
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Polar bear

Quote:
Originally Posted by Crop Duster View Post
I have a 2016 27HFS Hyper Lite that has a Dometic single zone LCD thermostat. The thermostat seems to work intermittently with the temperature set point. When I go to bed at night I'll set the temp to 60 degrees. Sometimes I'll wake up in the middle of the night because I'm hot and I'll find the A/C is not on. The temp is still set to 60 in the thermostat but it is not kicking the A/C on. If I turn the thermostat off and turn it back on the A/C will come on. This does not happen every night but it has happened a few times now. Any ideas? I looked in the manual but this was not covered in troubleshooting. Thanks
Are you part Polar Bear? 60 is way low for most people. What was outside temp? The most you can hope for is 20 deg difference.

Take more clothes off and add a floor fan.
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Old 08-06-2016, 11:31 PM   #8
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I had the chance to test it out during the day and it stayed cycling throughout the day. I'm going to be away from home for the next couple weeks but after I get back I'll be sleeping in it again (summer home) and I'll really get to try it out.

I'm in northern MN where it's hot and humid. Outside temps at night are anywhere from 55-65 but it can be humid.
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Old 08-24-2016, 07:58 PM   #9
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I've spent the last 2 nights in the camper after being away for the last few weeks. Last night the A/C did not work correctly again. I had it set at 61 and when I woke up it felt warm inside. I turned the thermostat off and checked the temp on it. The thermostat was reading 69 degrees. When I turned it back on the A/C immediately kicked on.
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Old 08-24-2016, 08:14 PM   #10
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hot flash

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I've spent the last 2 nights in the camper after being away for the last few weeks. Last night the A/C did not work correctly again. I had it set at 61 and when I woke up it felt warm inside. I turned the thermostat off and checked the temp on it. The thermostat was reading 69 degrees. When I turned it back on the A/C immediately kicked on.
Must be early onset menopause.
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