Question about Dometic Rooftop RV Air Conditioner

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Dometic rv ac freezes up - Dometic Rooftop RV Air Conditioner

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  • Master
  • 674 Answers

Check your air filters first. Then make sure the fans are running. If they are not let me know. If they are then get the refrigerant charge checked.

Posted on May 26, 2010

  • Brian Niten Jun 02, 2010

    Did this not help any or have you gotten your a/c fixed yet?

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Posted on Jan 02, 2017

SOURCE: dometic ac in RV

IT NEEDS A RELAY BOARD IN SIDE

Posted on Jul 25, 2008

  • 2692 Answers

SOURCE: How do I clean out the vents in my RV Dometic roof

Take it off,the plastic inside vents, with soap water and a hose wash it.  Outside condendor and inside evapator, making sure the drain is open and outside shroad removed, brush off fthe loose stuff. wet both units, put liquid dishwashing soap on both. Spray then through , with a hose untill they rince clean.  While up there. Oil the motor if possible.  Keep the drain clear and open,making sure none of the water is getting into the RV.

Posted on May 10, 2009

motor1258
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SOURCE: My Duo-therm Brisk-Air by Dometic rv ac wont cool.(The fan runs )

Usually just listening closely will give you a rough idea where to look for problem. When you have the fan on and switch to cool, (with temperature turned down low obviously) do you hear any type of "moaning" sounds from AC unit, or see lights in RV dim slightly indicating that compressor is trying to engage? Is the breaker tripping when compressor tries to engage? Do you hear a "click" from AC unit when switched to cool? If none of that happens, then I'd start thinking thermostat, or compressor relay. Normally if it's a faulty capacitor, the compressor will try to engage but will make a "moaning sound" and usually trip the breaker due to excess current draw. Someone experience in electrical should be able to test relays etc, but whoever does work on it, should be aware that those capacitors, as well as hydro in general are very dangerous to work with. The ("zap",- Shock) that you can experience from a capacitor or hydro, can be fatal.

Posted on May 30, 2010

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sounds like you don't have enough of a charge in the system of "free-on". that would make the a/c cycle and cycle to try and keep the pressure up and would also contribute to the lines frosting and freezing

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Sounds like your freeze sensor is defective and since it is still under warranty, you would void it if you replace it yourself.

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If it's the pencil type, it just pokes into the fins (carefully)
If you look real close with flashlight you should be able to see where it poked in before, usually a couple of inches up from bottom. If it's the little round disc, it snaps in down in bottom corner, there should be a small hole for it in the frame.

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