Question about Dometic Rooftop RV Air Conditioner

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Compressor will not shut off.

I have a 595 Series Quick Cool (59516.501). It sounds like the a/c compressor runs even when the a/c is turned off at the thermostat. The fan works fine. The only way I can shut it off is to kill the power at the circuit breaker. Is this a capacitor problem?

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Could be a thermostat problem

Posted on Oct 02, 2009

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My magic chef model ctn1911gew is not working properly makes a clicking sound and is not cold at all and fan on bottom is not running. please help


Are we talking about the fan near the compressor? It is important to know if the compressor itself is running. If there is a loose connection to the compressor via the start/over load relay (normally attaches directly onto the compressor), or if the start/over load itself is bad the compressor will not run. It will click trying to turn on untill the over load gets hot Check to see if your compressor is really hot. Could be bad start/over load relay or bad compressor. Try unplugging your frig for say 30 min then, with your hand on top of a cool compressor, plug the frig back in and see if compressor smoothly vibrates for at least 5 min without becoming very hot or shutting off even though fan continues to run. The fact your fan is not running could itself be the problem. It is needed to keep the freon, and the compressor cooled.

If you need further help, reach me via phone at https://www.6ya.com/expert/steve_24d988f3507f7480

Oct 12, 2013 | Refrigerators

1 Answer

My rooftop A/C on my fifthwheel does not turn on.


Good possibility it has a fan capacitor gone, but a voltage/ohm, check would be required, and if your not experienced in that area, can be VERY DANGEROUS, if you don't know how to handle them as capacitors can zap you with high voltages (approx, 370- 450 volts) even when disconnected from power. If you know an electrician, that would certainly help.

Jun 18, 2010 | Heating & Cooling

2 Answers

Compressor shut down very quick then it turn on again after 3-5 sec it's off.., what is the solution?


MY HAVE A LOOSE SPADE CONNECTION AT MAIN THERMOSTAT RELAY. MOST OF THESE UNITS DONT HAVE HIGH OR LOW FREON PRESURE SWITCHES BUT YOU NEVER KNOW ON NEW UNITS CARRIER MAY HAVE THEM WHICH MY MEAN LOW FREON OR CLOGGED CONDENSER COIL  THE OUTSIDE COIL LAYERS IN DIRT,BUT THATS NOT A QUICK ON OFF .BURNT WIRES ON COMPRESSOR OR BLOWN RUN CAPACAROR CAN CAUSE QUICK ON OFF. WE HAVE INSTALLED A START CAPACATOR WHEN COMPRESSOR DOES NOT START AT ALL. CHECK FOR LOOSE WIRES ON TERMINALS THEY MUST BE PULLED TO CHECK THEM,THEY CAN SEEM CONNECTED BUT THEY ARE LOOSE. OTHER CAUSES MAY BE THE PROBE IN FRONT OF EVAP COIL WHICH IS TSTAT BULB. STICK IT IN HOT WATER AND IT SHOULD KEEP STAT CALLING FOR COOL.

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A/c turns on for 10 minutes


If it was start up capacitors, it wouldn't start initially every time. Do me/you, a favor, and remove your filter inside (return air) , and if it's a ducted system, remove entire plastic cover inside. Take a flashlight & look way up where filter covers in hole & take a good look at cooling fins on evaporator (front of AC). Look for restrictions such as dust etc. That dust will turn just like mud on there due to condensation mixing with dust, and block off flow which could cause unit to freeze up & compressor to kick out. If your real ambitious, and find lots of dust there, taking cover off roof unit would be next, and check same there at back end (condenser) coils & cooling fins.Get back to me after inspection from inside. Could still be electrical but lets check that it has proper maintenance & best chance to work properly by doing this first.

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1 Answer

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You probably have a defective thermostat or sensor for reading the temperature.

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Duo-therm quick cool


Your compressor is trying to restart after it shuts off which is causing a power draw down changing the sound of the fan speed change. Check voltage power supply and insure that the power supply cord is heavy enough to carry the necessary load.

Jun 28, 2008 | Dometic Rooftop RV Air Conditioner

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