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Claytonj · 09-14-2021, 06:44 PM

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 don’t understand why the compressor isn’t kicking on either? Am I missing something here???

Claytonj · 09-14-2021, 07:08 PM

Any help/suggestions would be greatly appreciated, please help, I do not want to buy another unit again.

AirstreamJim · 09-14-2021, 07:16 PM

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. You’ll find that sub-forum here:

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

You’ve come to the right place—the 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 you’ll definitely get good responses.

Good luck.

Jim

Claytonj · 09-14-2021, 07:40 PM

Thanks Jim!!! New to this forum stuff

Wazbro · 09-14-2021, 07:50 PM

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.

SeeMore · 09-14-2021, 10:55 PM

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.

Belegedhel · 09-15-2021, 07:56 AM

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?

Claytonj · 09-15-2021, 05:54 PM

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.

Claytonj · 09-15-2021, 06:59 PM

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.

Claytonj · 09-16-2021, 06:31 PM

Anybody have any suggestions?

Belegedhel · 09-16-2021, 08:05 PM

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!

Claytonj · 09-20-2021, 05:54 PM

The motor does not start moving on its own, I tested the capacitors with ohm/continuity setting. Went to near zero then back towards infinity incrementally after discharging. This unit just has the one capacitor

Claytonj · 09-20-2021, 05:58 PM

https://www.airforums.com/forums/attachment.php?attachmentid=404505&stc=1&d=1632182 126

Belegedhel · 09-20-2021, 07:15 PM

Did you try the give-it-a-spin manually trick to see if it would take off operating?

Claytonj · 06-16-2022, 07:53 PM

Revisiting this post, now that I’m attempting to fix this issue again because of the 90+ degree temps we are having in Arkansas. I’m stuck here, I ordered a new motor, and just received it today, only to find out it’s the wrong one. I have a genteq motor on this unit. I still feel like it may not be the motor in fact. I am leaning towards that rotary selector switch now, and will do some continuity testing tomorrow to see. It just seems odd to me that I have no compressor, or fan movement/start. I feel like I’m missing a simple fix here..maybe not the motor itself. Why would I have no compressor/fan movement at all? And to the post above from Beledgehel, yes I have tried to spin the motor with selector switch in on position, with no response. If anyone else has some advise, it would be greatly appreciated

Claytonj · 06-16-2022, 08:21 PM

I love to troubleshoot, and fix problems like this, but I need a little advise from someone that may have some experience with this issue/or experience with these dometic a/c issues. Needless to say, anything labeled Dometic in this rig has a problem. I am extremely frustrated with all of their products, even to the point of pulling the trigger on a Coleman Mach a/c unit with the new Bluetooth air distribution box that will cycle the compressor and fan off when set temps are reached. Seems like a money saver to me. Anyone have that unit and has input on the quality will also be appreciated

Belegedhel · 06-19-2022, 06:15 AM

Sounds like you haven't checked to see if power is actually getting to the motors. I would suggest putting the selector switch to the "on" position and then using your multimeter to measure what voltages you have coming to the motor. If you aren't seeing voltage, then work your way backwards, component wise (pressure switches, thermostats, selector switch, etc.).

good luck!

Claytonj · 07-16-2023, 07:23 AM

I know it’s been a long time, but maybe this thread will help someone else in the future. I found the culprit. For some reason, the factory came up out of the breaker panel and up above where we keep towels and such by the shower (same wall as the breaker panel) I pulled off the overhead trim panel and discovered there are two crappy little plastic junction boxes where both a/c unit’s wiring goes from the breaker panel to these boxes, then distribute to the a/c unit with the wiring. Man are they junk…all plastic little grey box with “push the wire in and close it up” connectors. Look like little knives that pierce into the wire to connect. Anyways, found that the neutral wire (white) appeared to never had a solid connection when it was “pierced” through the insulation, so I had lost my neutral connection there….needless to say, I got rid of that crap and wired them in direct. Haven’t had a problem since! All this said, make really really sure your voltage is there and check for any problems coming from the breaker all the way to the unit with your wiring. This caused me quite a bit of headache but I was glad to have solved the issue. I hope this can help someone in the future, and sorry for abandoning this post for so long….I hate it when you look all over the internet and you find a post that matches your symptoms and then there is no solution. Didn’t want to be that guy! Good luck with your endeavors!