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Old 06-19-2017, 06:04 AM   #1
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Ac/thermostat issue

Came home yesterday to find it hotter than he'll in the 5th wheel. My furnace was running. Checked thermostat and it was registering the indoor temp at 32 degrees f..thats why furnace was running even though it was 90 inside any ideas?
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Old 06-19-2017, 06:16 AM   #2
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Ac/thermostat issue

Did it get changed to Celsius instead of Fahrenheit by chance??
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Old 06-19-2017, 07:07 AM   #3
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No it was reading 0 Celsius
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Old 06-19-2017, 07:10 AM   #4
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I played around with some of the wires on the outside on the roof unit and would get it to register the correct temp so.the ac would kick on but about two min later it would shut off and register 32 degrees again and the furnace would kick on. I changed it off if auto but then nothing would work because the thermometer still was recognizing the them as 32 degrees
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Old 06-19-2017, 07:40 AM   #5
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Try disconnecting power to the thermostat for 5 minutes. On my camper, you can do that by pulling the 12 vdc fuse that is labeled kitchen.Often, electronics can get "stuck" and need a reset. Removing power gives it that reset.
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Old 06-19-2017, 08:28 AM   #6
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I didn't see where you posted any information about what brand/model A/C system you have so it's hard for us to help much.

I've read here some Dometic systems can get corrosion on the data cable that runs from the 'stat to the control at the A/C unit and cause funky problems. You might check if yours is one of those.
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Old 06-19-2017, 01:37 PM   #7
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It is a domestic. I have had the communication error E1 in the past. This time it was working as it should if the temperature was actually 32 fareheit. So it is not sensing the actual temp but thinking it is 32. That was only zone 1, zone 2 was sensing 88 and that air was running but the furnace was running in main area
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Old 06-19-2017, 05:31 PM   #8
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I'd clean the wires up at both ends and try to initialize the t-stat. You could also check the thermister connections to the board in the t-stat. If it doesn't work you likely have a bad thermostat.
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Old 06-19-2017, 06:00 PM   #9
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It may help to initialize the thermostat. Instructions are in your manual.
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