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Old 06-18-2021, 05:13 PM   #1
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Dometic AC possibly Dead Again

Original owner of 2017 270S. It has a 15K & a 13.5K Dometic AC. front replaced right after purchase due to completely rusted out internally. Rear replaced apx 12-14 months later due to low output/high amps.

The rear never really put out very much cold air EVER. I doubt they are 13.5 K. Now my front appears to be on its last legs. One is already missing - low. I barely have a 5 degree drop in air temp between in and out.

Doing the same thing and expecting different results is just plain stupid. I have zero desire to purchase and repeat the same **** every 1-2 years. I can't believe that this is normal but being RV I can. Feedback appreciated. Due to the inaccessibility of any wiring for thermostats, ... (not power). is a different brand even a solution or is that trading the devil i know for another I don't?

Suggestions (valid) welcomed. Supposed to leave on a trip in a week - don't know now.
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Old 06-18-2021, 06:22 PM   #2
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There might be an explanation for the failure in this post but it doesn't really help you: https://www.forestriverforums.com/fo...ml#post2203333

Bad run? A lady with whom I talked to at Dometic told me that they were somewhere in the 15,000-17000 count of bad units. She told me that it was a problem with the factory in China that built the condenser coils. They soldered the joints together but "forgot" to run them through a wash of some sorts to remove any residual flux on the soldered joints which led to the flux eating pinholes in the copper lines. I am very familiar with this process and the joints must be cleaned after soldering. Oddly enough the lady told me that Dometic did not have a list of serial numbers of units which "could be" in the bad run of condensers.

From other posts I've read, the bad units seemed to have been built roughly around 2017 and would fail after a few years.

Have you ever cleaned your evaporator coils? If not, that can cause a pretty noticeable cooling performance hit.

I attached a PDF and the first eight pages deal with cleaning the evaporator coil on an Atwood (owned by Dometic) AC-1511. While your disassembly procedure might be different, perhaps there is something in the PDF that might help you take a look at your evaporator and see how dirty it is.

Ray
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Old 06-18-2021, 06:50 PM   #3
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I contacted my friend in the AC business. The only serviceable part is the capacitor, but with the compressor and fan both running, it can't be that. It must be a non serviceable freon leak.

The only question is who has the lowest price without waiting 4-8 weeks?
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Old 06-18-2021, 07:26 PM   #4
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Had the same thing happen on our 2017 Surveyor, on my 2nd Dometic 13,500 on the front and the rear quit 2 years ago, replaced it with a Coleman using a conversion kit and never looked back. When the front dies again it will also be replaced with a Coleman
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Old 06-19-2021, 12:34 AM   #5
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What is the conversation kit? Please elaborate - Roof mount, thermostat, ...?

Thanks
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Old 06-19-2021, 05:58 AM   #6
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The conversion kit consists of a wiring adapter for the control box and a mounting plate inside the RV. The cable allows for the Dometic thermostat to work with a Coleman Unit.
https://www.airxcel.com/rv/coleman-m...ts/air-vantage
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Old 06-19-2021, 07:04 AM   #7
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Did you have any problems with the Coleman being significantly longer and slightly heavier?
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Old 06-19-2021, 12:42 PM   #8
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Quote:
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Did you have any problems with the Coleman being significantly longer and slightly heavier?
Nope, it is maybe 10lbs heavier and fit perfectly. It blows good and cold and along with the Dometic unit (that is louder) it cools the camper down very quickly even on a 100 degree day.

I have my camper plugged in at home on a 30 AMP and set the thermostat to 90 in the driveway, it runs all summer long, I just want to keep the coach from baking.

I am done with Dometic A/C units.
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Old 06-19-2021, 02:50 PM   #9
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Quote:
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Did you have any problems with the Coleman being significantly longer and slightly heavier?
Furrion also has adapter (wiring) adapters to use their units to replace all the other major brands. And their stuff is top notch!

My question is though, have you contacted Dometic to see if there is any warranty for these defective units that they know about?

Our camper is a 2012 it has two Dometic 13,500 units, both are original and working just fine still.

I do go up on the roof each Spring and remove the cover and clean the condenser and evaporator coils. Dirty coils Seriously hamper the units efficiency

I also clean the filter on the unit every month during camping season, whether we use the camper or not.
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Old 06-19-2021, 03:35 PM   #10
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Same Domestic experience w my 2015/16 AC

This is the first that I have heard of this AC freon loss. BUT this is exactly the way one of my 2015 units built on my Coachmen 2016 RV is acting. It has slowly lost its cooling capacity as if it has a leak OR was undercharged at the factory. I purchased a replacement control box kit, which also came with another temp probe. As the unit was icing up (a low freon type problem) I first moved the location of the coil iceing sensor probe. Then orderd the entire board with a new sensor. When I got into the unit I found a 3rd sensor heavly taped, obviously an original sensor and the one now in the coil an already replacement. The explination of the bad weld job perfectly explains a realestic cause. I have a new Furrion just sitting on the roof just waiting for a dry day for me to remove the old and install it. Thus I am glad I purchased a new unit, however I wish I had known and asked Domestic for assistance with a replacement/discount. My BIG question is what should I clean the welds on the other Domestic that currently blows a 25 degrees differental. Any commnets appreciated. And and glad I chose to change brands.
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Old 06-19-2021, 05:09 PM   #11
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Quote:
Originally Posted by 270S View Post
I contacted my friend in the AC business. The only serviceable part is the capacitor, but with the compressor and fan both running, it can't be that. It must be a non serviceable freon leak.

The only question is who has the lowest price without waiting 4-8 weeks?
100% NOT TRUE!
I have fixed dozens of sealed rv air conditioners. Replaced compressors, flexed leaks, ect. Just because there are no services ports from the factory doesnít mean I canít add some in 10 minutes. Call any reputable ac company and they can fix it with very little issue.
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Old 06-19-2021, 06:03 PM   #12
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2016 Georgetown 335DSF We have replaced 4 A/C's since new. Three under warranty, but the last one we paid out of pocket a few weeks ago. All were made in China. This last one installed, is made in Mexico, which the mobile Tech said has better quality control. Keeping our fingers crossed.
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Old 06-20-2021, 10:26 AM   #13
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100% NOT TRUE!
I have fixed dozens of sealed rv air conditioners. Replaced compressors, flexed leaks, ect. Just because there are no services ports from the factory doesnít mean I canít add some in 10 minutes. Call any reputable ac company and they can fix it with very little issue.
That is not servicing - that is a total modification. You have to cut the lines, insert the service valves, evacuate, refill, .... and you still have not fixed the leaking lines who know where. A 100% sealed unit should last 10-20 years. These were obviously defective. I will be calling Dometic tomorrow before i purchase one at my expense.

Thanks for the info re the 17K defective units. I'll be sure to mention it.
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Old 06-20-2021, 11:07 AM   #14
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BTW, Dometic units came with a 2 year warranty.
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Old 06-20-2021, 11:15 AM   #15
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AC problems

I have a 2019 sand sport toy hauler and the thermostat keeps switching to furnace. I put it on cool and the back to furnace. Help please
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Old 06-20-2021, 11:48 AM   #16
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That is not servicing - that is a total modification. You have to cut the lines, insert the service valves, evacuate, refill, .... and you still have not fixed the leaking lines who know where. A 100% sealed unit should last 10-20 years. These were obviously defective. I will be calling Dometic tomorrow before i purchase one at my expense.

Thanks for the info re the 17K defective units. I'll be sure to mention it.
I can charge up a factory unit in 15 minutes. No cutting, no vac pump, just gas it up and see how long it lasts. Could last a week could last 2 years. The point is these donít have to be disposable. They can be fixed cheap and easy.
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Old 06-20-2021, 11:48 AM   #17
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We had ours quit cooling in 2018 on our 2016 FR Forester 3051S. Purchased a Coleman. Repairman stated Dometic had lots of issue then.
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Old 06-20-2021, 11:49 AM   #18
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Quote:
Thanks for the info re the 17K defective units. I'll be sure to mention it.
Yes, please do. I'll be interested in how they respond.

FYI, I recently had to contact Atwood, owned by Dometic, and got the usual first-line script-reader who told me I needed to go to a dealer. I just politely asked for the ticket to be escalated for further review and lo and behold, the next person to respond knew exactly what was going on.

Ray
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Old 06-20-2021, 11:49 AM   #19
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Wouldn’t cover ours!
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Old 06-20-2021, 04:29 PM   #20
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I can charge up a factory unit in 15 minutes. No cutting, no vac pump, just gas it up and see how long it lasts. Could last a week could last 2 years. The point is these don’t have to be disposable. They can be fixed cheap and easy.
Unless you made major modifications that i mentioned, there is no way to recharge these units - THERE ARE NO SERVICE PORTS.

I think it is intentional due to lawyers - I assume they don't want an AC tech falling off the roof. As if R&R an entire unit is safer - LOL.
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