Question about Dometic Rooftop RV Air Conditioner

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I am replaceing my ac unit 630035.321 ac/heat duo-therm low prof.with 641515.301ccc but i had no paper work for install do not need heat on this unit

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  • Dometic Master
  • 4,292 Answers

Dip switches correct

Posted on Sep 15, 2017

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Posted on Jan 02, 2017

  • 46 Answers

SOURCE: Duo-therm fan only runs on low

useually a sticking fan relay in the controll board this is the closeest unit to a home based cenral air system and i would leave this one to the experts if you want to trouble shoot there is a detailed wiring diagram on the back side of the pc board cover on the fan and compessor unit it self there is a seperate relay for each speed on your unit make sure getting power to selected relay if not trace wiring and do continutity tests back to themostat

Posted on Aug 01, 2009

motor1258
  • 6674 Answers

SOURCE: have a duo therm ac and the low ac and low fan not work -

Thermostat on wall, or manual controls at AC? Did it work for you on low before now? Reason I ask, is that normally they are only a 2 speed fan ( low and high) so if it's a wall thermostat and has been changed from original, perhaps it the way the thermostat is wired.

Posted on Jul 10, 2010

  • 381 Answers

SOURCE: duo-therm heat pump model # 630035-331 Unit

Can you give us some more helpful information-- so we can help diagnose the problem:
Like-- what is the outside temperature?--

Have you been able to get heat out of your heat pump before, at this low of an outside temperature?

And which fan are you talking about-- the inside fan, or the outside fan?

Is the inside coil getting nice and warm-- or just barely warm?
and is there frost on the outside coil-- Can you defrost it, but shutting the unit off until the ice is cleared?

Let us know, and we'll better be able to help you to the next step.

Mack B

Posted on Jan 15, 2011

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1 Answer

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Aug 08, 2010 | Dometic Rooftop RV Air Conditioner

1 Answer

Have a duo therm ac and the low ac and low fan not work -


Thermostat on wall, or manual controls at AC? Did it work for you on low before now? Reason I ask, is that normally they are only a 2 speed fan ( low and high) so if it's a wall thermostat and has been changed from original, perhaps it the way the thermostat is wired.

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I had to get on the roof of mine, remove the cover and manually spin the fan. Add a little oil to the shaft where it goes thru the bearing. All of this is done on the roof side. Mine required this procedure every spring. Duotherm realizes they had a problem and have since corrected it but they don't deal with all of their customers that had the original problem.

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my duo therm air works beautifuly all day but at night when we go to bed it seams to turn on and shut off rapidly. what could be wrong?

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