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Old 09-05-2014, 07:34 PM   #1
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Need emergency help with AC

Brother in law just showed up at camp with a dometic AC that's not cooling. Fan runs fine but the compressor won't kick over. It's 87 in his trailer right now.

Any ideas?




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Old 09-05-2014, 07:49 PM   #2
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Is thermostat set in right mode
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Old 09-05-2014, 07:51 PM   #3
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Yep, it's the digital one, so fan speed on auto, set to cool, temp set to 70.



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Old 09-05-2014, 07:56 PM   #4
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I'd be willing to bet, thermostat or control box has issues. Been through that twice with these new units. Hate them.
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Old 09-05-2014, 08:15 PM   #5
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Thanks, he's planning to call the dealer tomorrow morning but we were hoping for some of that age old wisdom like "oh, yeah, there's such and such fuse".

I'll keep you up to date on how it goes. After we make up the spare beds to accommodate his family tonight.



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Old 09-05-2014, 08:24 PM   #6
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Quote:
Originally Posted by Kaadk View Post
Thanks, he's planning to call the dealer tomorrow morning but we were hoping for some of that age old wisdom like "oh, yeah, there's such and such fuse".

I'll keep you up to date on how it goes. After we make up the spare beds to accommodate his family tonight.



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Do you hear the compressor trying to start? Prob sound like a grunt for a few seconds then trip out on overload then repeat after 20-30 seconds??


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Old 09-05-2014, 08:41 PM   #7
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Low voltage could be one reason the compressor will not start.




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Old 09-05-2014, 08:48 PM   #8
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Considering the absolute storm that is hitting SW Ontario I would say staying away from AC Power would be a god idea tonight!
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Old 09-05-2014, 09:44 PM   #9
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Considering the absolute storm that is hitting SW Ontario I would say staying away from AC Power would be a god idea tonight!

Yeah, it hit us out of the blue. Got him convinced on the OldCoot poles though. My awning held firm, he was hanging from his (literally) trying to get my sister in law back to retract it.

Bonus though, the storm cooled everything off so the AC not working is no longer an emergency.

Thanks all for the tips so far.



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Old 09-05-2014, 09:56 PM   #10
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Dometic and Colman both will not handle a voltage drop very well. The end result of a voltage drop would be a burnt capacitor and or a control board.
I have posted pictures of this kind of damage a few years a go form work.
I worked at the Smithsonian's National Air and Space Museum Steven F. Udvar Hazy Center in Chantilly VA.we had 5 park booths we Dometic roof top units on them and we had to replace all 5 of with in the first 6 years because of this problem.
Dometic has a commercial type which we bought for one of the last replacement and as far as I know it is still in operation....I left the Museum 3 years ago.
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