Free 7 Day Trial RV GPS App RV Trip Planner Campground Reviews RV Maintenance Free 7 Day Trial ×
RV Trip Planning Discussions

Go Back   iRV2 Forums > THE OWNER'S CORNER FORUMS > Newmar Owner's Forum
Click Here to Login
Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
Reply
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on iRV2
 
Thread Tools Search this Thread Display Modes
 
Old 07-27-2021, 02:24 PM   #1
Senior Member
 
hugh37's Avatar


 
Join Date: Jul 2007
Posts: 561
My Dometic Front Roof Air Conditioner Has "Quit"!

I purchased my coach new in July, 2015, and from all reports consider myself fortunate that this is the first time one of the three roof air units has failed me. It's my front unit, a Dometic 15,000 with heat pump. It had performed well during the winter months in Florida. End of this past March I parked it at my residence with 50A service, leaving all the air units turned on. All was fine, I thought, until when preparing for a trip end of June, I observed the thermostat showed "ERR 7" for the front unit. I promptly found the breaker had tripped. I flipped it on and immediately heard the front unit come on, then the compressor kicked on and cool air was coming out. A brief time later the unit turned off, without tripping the breaker. I attempted a few more times with things no better. I called my mobile tech friend and he was quick to show up. At my 84 years "young", I chose to stay on the ground and inside the coach. The tech said he found the Start capacitor bad, but spun the fan wheel and the motor started and the unit performed fine. But, once the unit cut off it would not restart, without again manually spinning the fan wheel. He went and purchased a Start capacitor (88-108 mfd 165VAC) and installed it. No success. With doing nothing more he said he felt the fan motor was bad and strongly recommended I take the coach to an RV AC specialist, who he named, and who I know and have used. I called and was informed the earliest available appointment was in September. So, I decided to proceed to the roof (much to my wife's dismay) and check things out, with the aid of YouTube and researched materials. I assumed the tech had left the new Start capacitor in, but when tested found it bad. I then checked the Run capacitor (55/15 mfd 370VAC) and found it also bad, with readings far below the specs called far. I spun the fan wheel and it turned freely, no binding. I also observed that the unit was reasonably clean. Only the Start capacitor was available locally, with no vendor having the Run capacitor in stock. So, I ordered the two online and expect them this week. In the meantime I'm curious about the fan motor (F48AE48A61), should the capacitors fail to do the trick. I didn't hear anything noisy, like bearings, etc., from the motor when running. I've noticed a great many on this forum are quick to recommend "trashing" of the whole unit. With replacement motors online for under $200. and returnable, why not try replacing it? Is it not worth the effort of removing and replacing? I would expect to pay over $2,000. for a new like unit, plus labor, unless I manage to tackle the job, with a friend's help. Hate that I've made this thread so lengthly, but do request your thoughts, opinions, suggestions, that just might help to resolve my situation. Thanks, in advance, to any and all, who respond!
__________________
Larry & Sara
'15 Newmar DSDP 4369, 450 Cummins, Freightliner
'07 Honda CRV Toad, Demco Dominator Towbar
hugh37 is offline   Reply With Quote
Join the #1 RV Forum Today - It's Totally Free!

iRV2.com RV Community - Are you about to start a new improvement on your RV or need some help with some maintenance? Do you need advice on what products to buy? Or maybe you can give others some advice? No matter where you fit in you'll find that iRV2 is a great community to join. Best of all it's totally FREE!

You are currently viewing our boards as a guest so you have limited access to our community. Please take the time to register and you will gain a lot of great new features including; the ability to participate in discussions, network with other RV owners, see fewer ads, upload photographs, create an RV blog, send private messages and so much, much more!

Old 07-27-2021, 02:36 PM   #2
Senior Member
 
Ricci's Avatar
 
Newmar Owners Club
Tiffin Owners Club
Entegra Owners Club
Join Date: Feb 2017
Location: Fulltiming Since 2011
Posts: 1,121
Hi - Capacitors are inexpensive so I'd go that route first. Is there a Grainger's in your area? They would likely have motor to match as well. As long as the compressor is not locked or leaking the AC is worth fixing.



Tom
__________________
Tom and Annie & Java
2020 DSDP 4369 Spartan
2022 Anthem 44B on Order
Ricci is offline   Reply With Quote
Old 07-27-2021, 03:48 PM   #3
Senior Member
 
hugh37's Avatar


 
Join Date: Jul 2007
Posts: 561
Thanks, Tom. You're right that capacitors are relatively inexpensive. Can you believe that the best price for a Dometic brand Run capacitor for my needs was about $63.00! Far out of line, seems to me. Disappointingly, Grainger had the Start capacitor, but did not have the Run (55/15 mfd) I need. I'm inclined to fix my unit, within "reason".
__________________
Larry & Sara
'15 Newmar DSDP 4369, 450 Cummins, Freightliner
'07 Honda CRV Toad, Demco Dominator Towbar
hugh37 is offline   Reply With Quote
Old 07-27-2021, 05:39 PM   #4
Senior Member
 
Ken C's Avatar
 
Join Date: Nov 2007
Location: Fulltime, Formally SF Bay Area
Posts: 515
Take a look at this discussion from last year. We had two capacitors (one on each A/C) fail within a few weeks of each other and the Dometic models were out of stock anywhere including from Dometic. In 100+ degree weather I would have paid the outrageous $65 to cool off. They are available for around $15, just slightly larger and take a little effort to get them installed.

https://www.irv2.com/forums/f103/dom...ts-502638.html
__________________
Ken C
2018 Dutch Star 4052 Spartan
2015 Jeep Cherokee Trailhawk
Ken C is offline   Reply With Quote
Old 07-27-2021, 06:00 PM   #5
Senior Member
 
Charles L's Avatar
 
Ford Super Duty Owner
Join Date: Mar 2017
Location: Chesapeake, VA.
Posts: 693
I just purchased a 55/15 capacitor

https://www.supplyhouse.com/Hartland...citor-370-440V

Took about a week to get it.
__________________
USN 1980-2004
2017 Sunseeker GTS 2800
2017 Jeep Grand Cherokee toad
Charles L is offline   Reply With Quote
Old 07-27-2021, 06:15 PM   #6
Senior Member
 
Holiday Rambler Owners Club
Join Date: Oct 2014
Posts: 226
EXACT same thing happen to me with my Dometic 15K BTU with heating coil (Not heat pump). A new motor fixed it. $120 for the motor and $75 to install it. Had to spin to get it started until the new motor was installed.
wajell is offline   Reply With Quote
Old 07-28-2021, 08:09 AM   #7
Senior Member
 
Luv2go's Avatar
 
Newmar Owners Club
Nor'easters Club
Appalachian Campers
Ford Super Duty Owner
Coastal Campers
Join Date: Dec 2007
Posts: 2,456
The start capacitor is only for the compressor. The run capacitor, you note, has two different values one values the larger one is for the compressor the second one is for the fan. I am pretty confident that replacing the run capacitor will fix the issue.
__________________
Stewart, Brenda and kids
2008 Newmar Canyon Star 3410, now at a new home
2006 Roadtrek Versatile 210
Luv2go is offline   Reply With Quote
Old 07-28-2021, 09:18 AM   #8
Senior Member
 
hugh37's Avatar


 
Join Date: Jul 2007
Posts: 561
Charles L...Thanks, that's where I found my 55/15. Expect to receive it in couple of days.


wajell...did your capacitor(s) blow first? What motor do you have and your source for the new?


Stewart...I sure appreciate your confidence! Hope to have both replacement capacitors in couple days & will carry along your confidence to my RV rooftop!


To prepare myself for the "worst scenario", must the fan motor be removed to test it? Can I apply AC power to it where it sits...or do whatever else to test whether it's good/bad?


For info...before posting this thread I spent considerable time researching this subject, including reviews of many threads on this forum.



Again, many thanks!
__________________
Larry & Sara
'15 Newmar DSDP 4369, 450 Cummins, Freightliner
'07 Honda CRV Toad, Demco Dominator Towbar
hugh37 is offline   Reply With Quote
Old 07-29-2021, 09:26 AM   #9
Senior Member
 
Holiday Rambler Owners Club
Join Date: Oct 2014
Posts: 226
Quote:
Originally Posted by hugh37 View Post
Charles L...Thanks, that's where I found my 55/15. Expect to receive it in couple of days.


wajell...did your capacitor(s) blow first? What motor do you have and your source for the new?


Stewart...I sure appreciate your confidence! Hope to have both replacement capacitors in couple days & will carry along your confidence to my RV rooftop!


To prepare myself for the "worst scenario", must the fan motor be removed to test it? Can I apply AC power to it where it sits...or do whatever else to test whether it's good/bad?


For info...before posting this thread I spent considerable time researching this subject, including reviews of many threads on this forum.



Again, many thanks!

No bad capacitor. Mobile tech went on the roof, took the cover off and said "bad motor". He called in the model # to Ron Hoover who had it in stock. I bought it and he installed it. The unit was installed in 2016 and the motor failed in 2018. The replacement motor was $200. No problems since.
wajell is offline   Reply With Quote
Old 07-29-2021, 04:40 PM   #10
Senior Member
 
Algoma's Avatar
 
Join Date: Nov 2007
Location: Charleston, WV
Posts: 3,340
The Harland 55/15 is bigger than the original Dometic one but I did find one on Ebay that was actually smaller. Unfortunately the 50 they had in stock have all been sold. But the one I got did fix my problem.
__________________
John and Mary Knight
2015 Newmar Ventana 4311 - wheelchair accessible
2015 Cadillac SRX Luxury AWD
Algoma is offline   Reply With Quote
Old 07-29-2021, 05:13 PM   #11
Senior Member
 
hugh37's Avatar


 
Join Date: Jul 2007
Posts: 561
John...The Hartland 55/15 is the one I purchased online...expect it as early as tomorrow. Then I'll have both replacement capacitors and ready to hit the roof...fully expecting they will do the job for me, giving me front unit air once again! Curious, John, what you purchased other than the 55/15? Just another brand name?
__________________
Larry & Sara
'15 Newmar DSDP 4369, 450 Cummins, Freightliner
'07 Honda CRV Toad, Demco Dominator Towbar
hugh37 is offline   Reply With Quote
Old 07-29-2021, 07:42 PM   #12
Senior Member
 
Algoma's Avatar
 
Join Date: Nov 2007
Location: Charleston, WV
Posts: 3,340
I actually bought both but used the smaller one as it fit better. Here is the smaller one, the only difference being the voltage rating. Which is fine for our 120v AC units. When I bought it 2 weeks ago they had 50 in stock but are now sold out. Must be a number of us having the same issue.


Click image for larger version

Name:	capacitor.jpg
Views:	12
Size:	44.1 KB
ID:	337720
__________________
John and Mary Knight
2015 Newmar Ventana 4311 - wheelchair accessible
2015 Cadillac SRX Luxury AWD
Algoma is offline   Reply With Quote
Old 07-30-2021, 05:44 PM   #13
Senior Member
 
hugh37's Avatar


 
Join Date: Jul 2007
Posts: 561
Today I received the 55/15 Run capacitor I was waiting for. Now, with the 88-108 Start capacitor already in hand I plan to climb on my coach roof tomorrow with hopes that these replacements will get my front air running again. Stay tuned.


P.S. Having little experience with and knowledge of capacitors, I chose to test them both. The 55/15 tested 54.9/14.96 +05-05%.
While both are within range, I expected higher readings, like new batteries. The 88-108 tested 88.
__________________
Larry & Sara
'15 Newmar DSDP 4369, 450 Cummins, Freightliner
'07 Honda CRV Toad, Demco Dominator Towbar
hugh37 is offline   Reply With Quote
Old 07-31-2021, 10:19 AM   #14
Senior Member
 
hugh37's Avatar


 
Join Date: Jul 2007
Posts: 561
With new capacitors in hand this morning I went on my coach roof, fully expecting my front AC to take off again, BUT that didn't happen and I've yet to figure it out. I'm certain I've wired the capacitors correctly (my understanding is that it's not important which of the two terminals the two Start capacitor wires are connected to.There are no positive/negative markings). Absolutely nothing happens...no sounds, breakers not tripped,etc. I tried 50A house power and Genset power at different times. I tried turning the fan, which turns freely, but made no difference. To make matters WORSE...neither of my other two AC units will now run, and there's been NO problem with either! QUESTION: Are they in some way connected to the front unit?? I can't accept that they, too, have crashed. Yet to inspect them, though. Could there be a THERMOSTAT problem, which affected the front unit and now has resulted in the other two not working?? Boy, I'd appreciate any thoughts out there. Thanks!
__________________
Larry & Sara
'15 Newmar DSDP 4369, 450 Cummins, Freightliner
'07 Honda CRV Toad, Demco Dominator Towbar
hugh37 is offline   Reply With Quote
Reply

Tags
air, air conditioner, dometic, roof



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Dometic roof air conditioner Fan Motor problem on heat pump rbguinn Alpine Coach Owner's Forum 4 11-09-2018 12:14 AM
A "Camper" is a "Camper, and a"Trailer" is a "Trailer"! OHVtime iRV2.com General Discussion 31 10-22-2017 07:57 AM
Sealant for Dometic Roof Air Conditioner Gasket deandec RV Systems & Appliances 13 09-25-2015 01:14 PM
Automatic Door Awning has "Quit" - Help, please... hugh37 Class A Motorhome Discussions 5 07-17-2011 12:46 PM

» Featured Campgrounds

Reviews provided by


All times are GMT -6. The time now is 11:06 PM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2021, vBulletin Solutions, Inc.