Question about Dometic Rooftop RV Air Conditioner

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My duo therm unit model# 57915,621 is cold but the therostate shuts the fan of but the compressor stays on.

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  • Dometic Master
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Bad control board

Posted on Oct 06, 2017

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Posted on Jan 02, 2017

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SOURCE: Duo Therm compressor tries to start and kicks out

I don't think these little units have a start capacitor but what I would do is check that the on/off switch wires to make sure they aren't loose. Also check the wires to the compressor for loose wires as well. It is possible that these are the first signs that the compressor is about to fail. They also can act up some when they haven't been used for awhile and then you try and start them up. Try running the unit for a few hours without asking it to cycle. It might just be a sticky valve.

Posted on Apr 13, 2009

  • 11 Answers

SOURCE: Duo Therm 13.5K Won't blow cold air?

needs freon. valve must be installed on unit in order to charge. if you know nothig about freon, call a repairman. Check craigslist.com

Posted on May 08, 2009

  • 52 Answers

SOURCE: compressor will not stay on

do you know if the fans are running constantly? and if so when the compressor comes on it trips out and the fan remains constant? i would like to know the running amps are they correct.

Posted on Jun 08, 2009

carlsbiz
  • 1124 Answers

SOURCE: i have a duo therm brisk air model 57915-001 leak

Could be the drain path is clogged.. Take the cover off & see if you can get it cleaned..

Posted on Jul 09, 2009

  • 587 Answers

SOURCE: Duo Therm kicking on the compressor, getting cold, but no fan!

Shut the power off to the unit, spin the fan blade to see if it spins freely. If it doesn't spin freely, (there appears to be a little drag when you spin it),the bearings are bad, if it does spin freely, then try moving the motor shaft from side to side if there’s any play in the shaft side to side then the bearings are worn and motor needs replaced. Then, check the capacitor, if it’s bulging even slightly, the capacitor is bad and needs replaced. Most of the time people replace the capacitor if motor seems ok. If capacitor is ok, turn power on to see if the motor is getting the proper voltage, if it is and not trying to run, then the windings are probably open, the motor's bad and needs replaced.

Posted on Aug 13, 2009

Testimonial: "Thank You. Since posting this question yesterday, i removed the cover, the shaft moved quite easily. I spun it and then turned on theunit. It works!"

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1 Answer

Duo Therm A/C (2009 Sabre RV) won't shut off


bad compressor relay on control board. The relay is not opening the circuit, allowing the compressor to stay running when unit is turned off. This overheats the compressor and opens a thermal disk shutting the compressor off. When thermal disk cools down, the compressor restarts under load and trips breaker.

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Brand new Duo Therm won't stay running


You really need an Ammeter to check this problem. Just because it is a brand new unit does not mean that there isn't a problem with it. Is it run off of a wall thermostat or manual controls? The compressor has a thermal overload switch on the top (under the plastic cover) that will take the compressor out of the circuit if it gets too hot. However, if the entire unit is shutting off, there is another problem. Selector Switch? Thermostat? Let me know what kind of controls you have and we can go from there.

Jul 01, 2009 | Dometic Rooftop RV Air Conditioner

1 Answer

Compressor will not stay on


do you know if the fans are running constantly? and if so when the compressor comes on it trips out and the fan remains constant? i would like to know the running amps are they correct.

Jun 08, 2009 | Heating & Cooling

1 Answer

Duo Therm compressor tries to start and kicks out


I don't think these little units have a start capacitor but what I would do is check that the on/off switch wires to make sure they aren't loose. Also check the wires to the compressor for loose wires as well. It is possible that these are the first signs that the compressor is about to fail. They also can act up some when they haven't been used for awhile and then you try and start them up. Try running the unit for a few hours without asking it to cycle. It might just be a sticky valve.

Apr 13, 2009 | Dometic Rooftop RV Air Conditioner

2 Answers

Duo Therm Quick Cool A/C fan motor cycles from low to high


sounds like the motor is either wired incoirrectly and getting 1/2 power all the time or it is going to ground. check out the woiring real good and duse your ohhm meter to check for gounds.

Dec 20, 2008 | Dometic Rooftop RV Air Conditioner

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