Question about Dometic Rooftop RV Air Conditioner

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Duo therm roof top a/c

Compressor comes on fan will not. I replaced the fan motor,it worked fine once on the test run. put it all back together tried it again, compressor comes on fan will not. Tried spinning while power was on nothing?

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  • skintknuckle Jun 02, 2008

    motor will not run when you turn it to fan. I tried spinning it will power was on it felt like some of the coils where on and some where not, motor felt like it was sticking in one spot. With power off it spins freely.

  • skintknuckle Jun 02, 2008

    motor will not run when you turn it to fan. I tried spinning it will power was on it felt like some of the coils where on and some where not, motor felt like it was sticking in one spot. With power off it spins freely.

  • Anonymous Jun 16, 2008

    the commpressor runs fan will not.replaced fan motor and run capacitor still will not run.I can hear relay click on hi position only.

  • depdawg Jun 28, 2008

    Compressor runs and fan does not. Replaced capacitor and still had problem. Checked voltage through relay board and there is 115 vac coming from both hi and lo outputs from board at the same time. Is this correct?

    all fuses good. I believe camper was subjected to a lightning strike. could problem be in the thermostat?

  • Anonymous Sep 19, 2008

    i have a penguin duo therm roof a/c at an rv. fan motor got hot and was spinning low. changed motor, it spins free, but will not turn at low, medium, high speed, just humms, gets hot. will change capacitor, hope this helps

  • terpie Oct 07, 2008

    motor fan is seized. Can I replace the bearings or do I have to buy a new fan

  • Anonymous Mar 28, 2014

    Air was working fine but now fan wont run without spinning manually could it be the start capacitor

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  • 49 Answers

Sounds like 1 of 3. Blower motor capacitor, relay or thermostat. Try to run fan only if that is an option and see.

Posted on Jun 01, 2008

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1 Answer

My roof top duo therm a/c unit was working fine this weekend untill it all of a sudden stopped blowing air the compressor kicks on but the fan does not
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Hi; You still have a loose connection somewhere. I have found just recently a problem with a customer with the same problem He had burnt wiring at the compressor terminals. Also check to see if the fan on top of R.V. is running when the inside fan is running they are connected together on the same motor up top. Also check for a dirty condensor coil this can cause the compressor to fail out on thermal overload...alpharome416

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May 17, 2009 | Dometic Rooftop RV Air Conditioner

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Have Duo Therm roof mount A/C. Fan runs but when compressor tries to come on it just has a hum sound for about 10 seconds then after a short period of time it tries again but will not kick on
It sounds like the compressor is locked up. You can try a start boost or hard start kit but once this starts the compressor is on it's way out.

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Same problem. I have a 2005 on a Rockwood Roo. Worked fine in October 2009. Not working June 2010. Problem is not a freon leak, compressor went bad. I banged the compressor gently with rubber mallet then with a hammer but that did not work. The fan runs, the compressor runs but gets hot. Also no indication of freon moving through system as everything gets warm from the compressor outward.

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My problem is the fan never goes off runs 24-7 and you can hear the compressor kick in from time to time. Is something wrong or do they all do that for a roof top unit? Any help on this one?
Frank

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