Question about Dometic Rooftop RV Air Conditioner

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AC will run fine for a while if it is very hot out, but compressor quits and will not restart. Wait several hours, and it works ok. When it is cool out(70's) compressor will not start at all. Help!

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  • arester15 Aug 03, 2009

    Thanks Motor1258

    The thermostat is wall mounted and appears fine. I suspect that the unit is not cycling through a defrost cycle, and freezing up. No help from Keystone RV's or dealers. Getting desperate!

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  • Dometic Master
  • 6,674 Answers

I suspect faulty thermostat. Take a blow dryer,( not too close as to melt cover ) and aim it at thermostat when ac won't come on, and keep good heat on it for a couple of minutes just to see if that trips it on. If that doesn't work, drop filter cover off ceiling assy and look for thermostat probe which should be visible in area behind filter cover, and apply heat to that , and see if it comes back on. Keep me posted.

Posted on Aug 02, 2009

  • Mike Butler
    Mike Butler Aug 03, 2009

    If it's freezing up, you should be able to see frost inside when you take your filter cover off and look at evaporator coils & fins. If this is a brand new unit, take entire cover off ceiling and get a good look at discharge side as well,especially if it's a ducted system, to make sure rubber roof or some other part(s) of the trailer is perhaps restricting flow of cold air to duct system. There also should be a freeze sensor button attached to coils, usually low on left side of coils area, and make sure those are attached to control board. By the way, for future reference, your better off to call Dometic, rather than manufacturer. Try, ( dometicusa.com ) for all your contact numbers etc, and owner support.

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