AC & Furnace both run at same time - Dutchmen Owners
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Old 04-01-2019, 05:50 PM   #1
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AC & Furnace both run at same time

I turned on my furnace and the AC came on as well. The only way I could get the ac to stop running was pull the breaker. Any ideas on best way to fix?
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Old 04-01-2019, 07:42 PM   #2
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I turned on my furnace and the AC came on as well. The only way I could get the ac to stop running was pull the breaker. Any ideas on best way to fix?
Is it the fan that is just running? Do you have a DOMETIC thermostat that looks like this?

https://tweetys.com/3106995-032.aspx...caAkE-EALw_wcB
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Old 04-01-2019, 09:13 PM   #3
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Yes it a Dometic just like the one you pulled up.. I do not know if it was just the fan or both but it is possible that it was just the fan
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Old 04-01-2019, 09:21 PM   #4
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Yes it a Dometic just like the one you pulled up.. I do not know if it was just the fan or both but it is possible that it was just the fan

Put the fan mode on 'Auto'.
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Old 04-02-2019, 12:37 AM   #5
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Put the fan mode on 'Auto'.
^^^this^^^

and welcome to the forum
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Old 04-02-2019, 04:46 PM   #6
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Originally Posted by Rubble57 View Post
I turned on my furnace and the AC came on as well. The only way I could get the ac to stop running was pull the breaker. Any ideas on best way to fix?



Ours did the same thing. I just said screw it and turned the breaker off like you did.


It is actually a good idea in our case. The thermostat is located in such a spot, that my wife or I can accidentally activate the unit by brushing by it, Sensitive huh!


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Old 04-07-2019, 01:09 AM   #7
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Had the same problem, make sure you have the fan on auto. Felt foolish when I took it to the dealer and the tech came out and showed me what I did wrong.
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Old 05-10-2019, 02:21 PM   #8
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I have to LOL, I did the same thing. Turned on the furnace and the AC kicked on. Stood there scratching my head in thought then noticed the fan was on manual. DOH!
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