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(Dometic) HP roof mounted air conditioner on my Alpine Coach…

Customer Question
I have a Duo-Therm (Dometic)...
I have a Duo-Therm (Dometic) HP roof mounted air conditioner on my Alpine Coach.
It's a 15,000 BTU unit in the rear bedroom.
The serial number is XXXXX Prod. no. XXXXXXXXX Model no is 630516.321.
When I start the rear unit it will run for 18-20 minutes, and then will short cycle. That is,
on/off every 2-3 minutes. I had a AC guy check it out and he gave me the following info: run capacitor 48.9uf, start capacitor 49.6uf, fan capacitor 14uf. It's really annoying, especially during the night.
The front ac (same unit) runs to the temp is reached and does not short cycle.

I would like to replace something before I have to spend the time and cash getting to a dealer!

Thank you,
John Heitzenroder cell(NNN) NNN-NNNN
Submitted: 12 years ago.Category: RV
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Answered in 5 minutes by:
6/10/2010
RV Mechanic: Randall, RVIA Certification replied 12 years ago
Randall
Randall, RVIA Certification
Category: RV
Satisfied Customers: 28,225
Experience: RVDA/RVIA Master Certified Technician with many years experience.
Verified
Hi: Thanks for coming to Just Answer with your question. My name is XXXXX XXXXX perhaps I can assist you with this. What usually causes this is a leak between the intake and discharge air. This can be fixed with aluminum tape in most cases. Go HERE for a complete Service Manual on this which has all the trouble shooting steps. This is the same manual we use. I like to provide my customers with a copy as there is a lot of great information in there. I would print out a copy of at least Bookmark it for reference. Get back to me if you need more help with this. R.J.
Randall
Randall, RVIA Certification
Category: RV
Satisfied Customers: 28,225
Experience: RVDA/RVIA Master Certified Technician with many years experience.
Verified
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Randall
Randall
Randall, RVIA Certification
Category: RV
Satisfied Customers: 28,225
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