This fall I was working on the rear A/C unit to get it going or whatever, and I found a post (I thought on this site) about a failure on the control card inside the A/C unit. It described the failure as a burned out �land� or printed wire, or whatever you want to call it. Since it sounded like the way mine had failed, I took the A/C unit apart and examined the control board, but could find no burned out �land�. But what I did find was a soldered in fuse that was �expended�. So I got a replacement inline fuse holder and .5 amp glass fuse and soldered it in. in place of the blown out one and when I put it all back together, the A/C worked just as it should. Just a blown fuse. Here is a picture of what the fuse looks like, in case any one else has a �loss of power to A/C� problem.




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89 Barth Regal 32
Runs like a Deere
New Hampshire

[This message has been edited by Jack (edited January 10, 2004).]

Good trouble shooting, Jack.

What make and model is the AC?

[This message has been edited by bill h (edited January 10, 2004).]

The A/C unit is a Duo Therm and the model number is 610015.103.

The Barthmobile 'thread' that got me to this solution was �Coindence or ?� and the last post on the thread is the one that I found very helpful.

https://www.barthmobile.com/ubb/Forum4/HTML/000410.html



[This message has been edited by Jack (edited February 27, 2004).]

Jack you are a lifesaver, plus a cash saver. Folled your instuctions, took two times as my .4 amp fuse was loose in the solder and gave false readings of being good. Second try was a charm, soldered in an in line fuse holder and put in a .5 amp fuse.

Great news, all systems on rear AC function as new.

Thank you.

Jim

That was a great money saving tip. I had something weird happen with my Dometic AC roof unit the other day. Camping out in the desert I thought I would run the generator for a couple hr.s. since I almost never use it. A little while later I noticed the rear AC unit was "ON" but it wasn't blowing. The indicator lights seemed dim too. I tried changing switch positions with the same result. Finally I decided to reset the main circuit breaker and suddenly the AC unit turned on normally. Do breakers wear out?

Breakers have a finite life. It depends on how many times they are reset, each time takes a little away. Check to see if there is extra load or if the starting load is working on the life. A breaker is more forgiving than a fuse so 110% will go thru but it will become additive so at some point a 30 amp breaker will drop out at 25 amps.
Tim

I know I'm digging up an old thread... However, this is exactly the issue that I'm having right now..with the same exact unit! I have powers to the roof top unit and to the board on top, but nothing happens. I tried going back to the post that is linked on this thread with no luck, may have been removed. Can someone please help? I'm looking for a picture of the inline fuse.. Thanks in advance!

welcome to Barthmobile. I don't have a pic of the Duo=Therm control board (I tired of dealing with those wretched units). However, most PCBs have component ID's silkscreened on the component side. Look for "F1" or "F"; fuses sometimes have glass housings.

Resistors will have colored stripes, and diodes are black with a silver stripe. Both would be about the same size as a fuse envelope.

Alright, I'm headed out there now! I'll let you know of the progress. Thanks!

Ok so I looked at the board.. I didn't see any "F" terminals... But I did find a glass terminal.. Is that it? Between the two Green terminals?

Please follow the directions on these pages for further picture postings. There are a few other suggestions and instructions on our site also. If you are still unable to grasp the information, I can show you how. Send me your contact information in a Private Message thru this website, by clicking on my name to open the private message dialog box.

Matt4469, Thank you for your diligent search in resurrecting the old air conditioner posting. Resurrecting this old post helps keep our archives in order. It opens up chances for new ideas on an old problem.

These people repair that board. http://dukeautomation.com/product-category/duo-therm/.

Thanks for the info! I was hoping the original poster would have the pictures he posted originally. Seems like he had the "fix". The old post the he referred to was deleted it seems.