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Old 07-03-2015, 09:21 AM   #1
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A/c won't come on in auto setting

My a/c had always worked well in the past. I have a 2014 Georgetown. I have a dometic thermostat. I set it to auto and it doesn't come on. All other settings work. Any ideas?
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Old 07-03-2015, 09:30 AM   #2
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Are you sure the air conditioner is working on the other settings - or just the fan?
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Old 07-03-2015, 09:32 AM   #3
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Would I be correct to say it's working because when on other settings it's cooling very well? So yes, the air conditioner is working.
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Old 07-03-2015, 10:41 AM   #4
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Beyond me then. Sorry.
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Old 07-03-2015, 10:49 AM   #5
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A/c won't come on in auto setting

Is it the single digital stat? If so, going by memory,,,or look in your manual. Turn off the t-stat, then hold the "+" then the "on/off" at the same time for a few seconds until the thermostat resets to factory defaults
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Old 07-03-2015, 11:17 AM   #6
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Thank you - I reset it and I did refer to manual. Your instructions were correct. However when in auto setting A/C still doesn't come on.
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Old 07-03-2015, 02:02 PM   #7
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Frequently we have the same problem...I make sure it's on cool, then auto and if it still doesn't seem to work, I set the thermostat down low then see if it works!
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Old 07-04-2015, 01:25 PM   #8
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Thank you. It just took awhile to cycle off because it was so hot. But it's working great.
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Old 07-04-2015, 01:39 PM   #9
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There's probably also a 5 minute timer on the AC, so it won't turn right back on, which is bad for the compressor. Timing is everything. You may have just tried Auto and the wrong time and manual at the right time.
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Old 07-04-2015, 01:54 PM   #10
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IF the Dometic thermostat unit has a clock in it, be sure and set the time. Been known to cause furnace issues in auto mode.
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