Question about Dometic Rooftop RV Air Conditioner

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Fan will not come on

Duo-therm roof top ac unit in trailer .fan will not come on .Compressor comes on when i turn the knob to cool but no fan.Is there a fuse of somekind in the unit that can be causing this?
airhead 757

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  • caguido May 17, 2009

    how would i access capacitor fan?I down loaded manual but do not see this on schematic.
    airhead 757


  • Anonymous May 19, 2009

    Fan will not come on!

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Maybe the capacitor for fan was already busted try to check that.

Posted on May 17, 2009

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Duo therm ac trips breaker


When compressor for cool tries to kick in, or even when fan only used?
Try it on fan only, not cool, then try cool and if you hear it sort of "moan" then breaker trips, that's compressor trying to kick in. Make sure you have sufficient power coming in to trailer as well, without long extension cord. Get back to me, then I can tell you which way to go from there.

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Not sure where your located, so check that unit didn't freeze up on you. Make sure evaporator and condenser coils/fins are clean and run on fan only to aid in thawing them out. Once you see condensation running off roof good, try using cool again and see what happens. When they freeze up, airflow gets restricted through unit. The outside fan and blower wheel for forced air inside are attached to same motor, so if fan is working, blower wheel should be turning as well unless it is broken, or allen key has come loose on clamp around center of blower wheel. Other possibility is that the blower wheel is turning but forced air ducts have blockage at inlet, which will require letting ceiling assembly down to inspect, or removing cover on roof and screws at front evaporator and opening it up. Make sure power is off during inspection.

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Have A Duo-Therm air conditioner on top of my motorhome and it stoped cooling, the fan works fine. Is there a fuse in the box under the filter? It says there is on the out side. I am not sure where it...


Can you please reply with model number off bottom of upper (roof) unit. Should be able to see it when filter is removed from ceiling assy. Please include model of thermostat if possible. You say fan works, but when turned to cool, no compressor kicking in? Try shutting unit off, and turn off breaker at panel as well, give it a few minutes and retry and see if anything changes and let me know.

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I have a duo-therm roof top unit. The fan or a/c will not come on. I opened the connection box and ckecked the fuse on the printed circuit board. Fuse good. reinstalled fuse and unit came on. Turned of...


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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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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