Question about Dometic Rooftop RV Air Conditioner

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I have a Duotherm rooftop unit for our RV. We turn the A/C on and it will run for about 10 minutes and it kicks the breaker. It doesn't seem to be pushing out the cool air like it should either when it is running those 10 minutes. We have cleaned the fan out and changed the breaker and it continues to do the same thing. Any Suggestions?

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  • sharebear92 May 23, 2010

    Can you describe more of what you are talking about---please? All I know is that the electric is run to the rooftop unit and it is hooked to a breaker. When you turn on the A/C, it will run for few minutes with very little cool air and the breaker will kick.

  • sharebear92 May 23, 2010

    We were out at the camper today and discovered that the RV Duotherm is hooked up to a 20 amp breaker and a 15 amp breaker. When we turn off the 15 amp breaker the fan and everything won't work. If we turn on the 15 amp breaker, it works but after about 5-10 minutes the 20 amp breaker kicks. We know that the fridge, and plugs in the kitchen area are also on that 15 amp breaker. Does this sound right to anyone?

  • sharebear92 May 28, 2010

    It is a 13000 or a 13500 btu ac unit. We did have an ac guy out and he looked at and cleaned the unit. He said very little dirt came out but it did help by reducing the amp pull. We are going to check it out this weekend to see how it runs. Hopefully, it won't kick the breaker anymore. After the repair was out and cleaned the unit, it was pulling 19 amps. Before, it would start out pulling lower amps and then continued to rise and then the 20amp breaker would blow.

  • sharebear92 May 28, 2010

    Oh, I forgot to mention that this is the original unit. It has never been replaced and trailer was bought brand new.

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WHAT KING OF CORD ARE YOU USING

Posted on Apr 24, 2010

  • airdoctorz May 26, 2010

    The ac roof unit should have its own designated 15 amp for most 11.000 btu  and 20 amp for the larger 13000-15000 btu units. whats not right is the 15 amp breaker you have should be only for ac. check the breaker to be sure someone did not double up other wires on this breaker. What is the main breaker 30 or 20 or 25. It seems when the 15 amp breaker dosent blow the 20 amp does. this would mean that the 20 is the main breaker which seems low for the main unless you or some else replaced ac to a 13000 btu ac when it was a 11000 before , and didnt change wiring from 20 amp and 30 amp main. make sure you are using a 30 amp thick rv cord . many people think they can run these on household orange 12 gage  100 foot cords. I use a welding cord converted for 110 volts. When I repaired rv ac it was always  a weak or soft darken copper cord.

  • airdoctorz May 28, 2010

    The tag on name plate should say what amp rating it runs at , but if it runs at 19 amps it is to close to to 20 amp rating of the breaker. you need at least 5 amps to adjust for hot days and lower voltage camp site demands.

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