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Old 09-14-2021, 06:44 PM   #1
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2018 33' Classic
Elkins , Arkansas
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Dometic a/c problem

I have a dometic brisk air 2 non ducted a/c with the knob control air distribution box. One night laying in bed, just stopped blowing. Thought it might be the breaker, was not. Have tested, good voltage coming into unit, switch seems to be distributing power through connector wires, all the way up to capacitor which tested good also. Replaced capacitor with new one, still nothing. No fan, no compressor kick on.....nothing at all. Compressor tested good with continuity check. Only thing I have not tested was the motor itself. Motor spins freely, but donít understand why the compressor isnít kicking on either? Am I missing something here???
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Old 09-14-2021, 07:08 PM   #2
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Any help/suggestions would be greatly appreciated, please help, I do not want to buy another unit again.
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Old 09-14-2021, 07:16 PM   #3
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While your post shows up on the portal page, it will soon scroll off the bottom and it will likely not be seen by most of the people who may be able to help you. You should re-post your question in the sub-forum specifically for air conditioner issues. Youíll find that sub-forum here:

https://www.airforums.com/forums/f427/

Youíve come to the right placeóthe knowledge base here at Airforums is unrivaled. But take some time to explore the entire site and make sure you post any questions in the forum most appropriate to the subject of your question. It may take a day or two but youíll definitely get good responses.

Good luck.

Jim
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Old 09-14-2021, 07:40 PM   #4
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Thanks Jim!!! New to this forum stuff
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Old 09-14-2021, 07:50 PM   #5
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Wondering is this on the 2018 33' Classic in your signature or a different trailer since I believe a 2018 33' Classic should have had ducted AC from the factory.
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Old 09-14-2021, 10:55 PM   #6
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Dometic AC diagnostic service manual can be had here:

http://bryantrv.com/docs2/docs/acservice.pdf

I would suspect either the high pressure switch (reset circuit to recycle) or the thermostat but the manual will cover all avenues.
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Old 09-15-2021, 07:56 AM   #7
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Houston , Texas
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If you put the controls in "fan only" mode does anything happen?

You say that you do not want to buy another unit again--can you give a brief description of what happened to the first one?
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Old 09-15-2021, 05:54 PM   #8
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Thanks for all the responses guys! Fan only does no good, nothing happens at all. I read through the instruction that SeeMore sent over thanks man! Think I’m going to try to test the rotary switch and see if that is the culprit. I must confess I do not have the airstream I just chose the closest footage I could to my trailer, I have a heartland mallard m335. It was pre wired for second a/c over the bedroom, and I bought the unit less than 2 years ago, so hence the not wanting to buy another one. My unit that came with the trailer also went poop, had to warranty that one. Living in this full time so had to pay a certified dometic mobile repair man to complete the warranty work, the unit I added over the bedroom I installed myself. Pretty simple and straight forward. Has been working great for a while until it just stopped. Needless to say, I am not impressed with the dometic a/c units that were assembled in China. Haven’t had good luck with them. The one that was warrantied was assembled in Mexico and it has been working flawless.
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Old 09-15-2021, 06:59 PM   #9
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So I went up there and tested the leads to the motor for continuity from common (white) to all other leads.....red, black, yellow, all good, then no good on brown wire that comes off of capacitor. Bad motor????? Would this cause the compressor not to start also? Have good continuity check on all terminals on rotary switch. Switch is working flawlessly.
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Old 09-16-2021, 06:31 PM   #10
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Anybody have any suggestions?
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Old 09-16-2021, 08:05 PM   #11
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I would expect there to be both a run capacitor and a start capacitor. You mention testing and replacing a capacitor--which one (and how did you test it)?

Well, here is a suggestion: Turn the AC on so that the fan and compressor should be running. Then go up top, and try manually spinning the fan motor shaft (make sure you are spinning it in the right direction), and see if it picks up and starts moving on its own.

It is something to try. If you have verified that the start and run capacitors are both fully functional (speaking of which, how did you test the caps?), then it could be a matter of a burnt motor winding (which is what that open brown wire might indicate).

good luck!
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