Thor Citation Sprinter Generator problem

I have an Onan 2800 propane Generator on my 2013 Sprinter that had a similar problem. With the A/C on mine would run between 4-8 hours and then would shutdown. It would start right back up but as soon as the A/C kicked on it would shut back off. This only happened after a very long initial run. This would happen in the middle of the night so it was not terribly hot outside.

I brought it to the Motorhome dealer who is also an Onan authorized facility and they somehow concluded the converter/charger was bad and was causing this problem. They replaced the converter and declared it fixed. I do not think they ever tested it.

Next trip out same problem. I contact the dealer who now claims it must be the A/C unit drawing to much juice on start up. In my mind I am thinking this is a generator problem but they are looking at other causes.

Instead of bringing it back to the dealer who is over 100 miles away and now wants to change the A/C I decided to find a local Onan shop.
The Onan shop actually let it run in their parking lot all day with the A/C on. After many hours it finally shut down. They concluded the control board was the problem, they removed the generator and replaced the control module.

I have given it one long overnight run since getting it back and so far the problem has not returned. My unit is a Class B but probably has the same genny.

Thanks Joe, the Thor Forum has a good thread. Interesting. Thor told my dealer that they had never heard of the problem before.

Ranger, do a Google search outside this forum. One of the hits I got was on the Thor forum site where there was a lot of comments about the problem, but no solutions as of yet.

Thanks, but I can't find any threads on this??

From what I have read this is a know problem
with the ACE and several others.
It is because of a lack of ventilation due
to how the factory mounted it.

Do a search for "Thor Citation Sprinter / Ace generator over heat problem"
and you will find many threads on this problem.