Question about Dometic Rooftop RV Air Conditioner

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Turn my roof top ac on , fan runs but when compressor tries to run lights in camper dims 3 to 5 sec. don;t kick breaker off, any ideas?

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You need to get a reading on the current draw of the compressor. Use a clamp on ampmeter to do this. Compare your reading with the data plate on the compressor. Your compressor may be getting ready to go out. You can also check the capacitor. If may be getting weak and need replacing. Another idea may be to install a hard start capacitor if the compressor is OK.

Posted on Sep 05, 2010

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1 Answer

My Dometic roof top ac doesn't cool. Fan runs fine, no COOL air. With thermostat in off position. Checking the voltages I found 118v at the breaker. At the run relay, 118v going in and a coupl


Please reply with Model number of bottom of AC unit ( upper) . Can be seen from inside usually. Thermostat model, plus if controls are at the ceiling assy or at thermostat on wall.

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I have a Dometic 57915.531 air conditioner in my camper. When the compressor goes on the lights go dim. Then if left on it will trip the circuit breaker. When I reset the breaker and turn the AC back on...


Hi,
The compressor is not always starting...sometimes it tries but does not start...
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Air Conditioner Trouble -Review the Possibilities
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Your unit is pulling too much power which is popping the circuit breaker. Either the compressor motor or Fan motor has a problem and you need a pro here. Drawing excessive electrical current is not good and you can do even more damage to your unit by continuing to try and run it!

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Just bought a used 1987 Real-Lite truck camper. The roof air unit is Dometic as well as the LP/AC refrigerator. When turned to "cool" the air conditioner really draws down, dims the lights, and eventually...


To start with, if it's plugged in to a 15 amp breaker, and extension cord, the compressor starting up may just be enough to trip the breaker. It will draw close to 15 amps on start-up of compressor, and if there is a light extension cord used to plug it in, that only makes it worse. Make sure you shut all other breakers off in panel except AC, and try it. If you have water heater on hydro, fridge on hydro, and then try to start AC compressor, you'll be way over the 15 amps, especially if it's a light extension cord.
Keep in mind, in order for fridge to work, you need 12 volts DC (Battery) power going to back of fridge. If the controls aren't lighting up at top, you've most likely got no 12 Volt DC power going to fridge. Check all fuses as well.

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Sep 13, 2009 | Dometic Rooftop RV Air Conditioner

1 Answer

If everything works on the roof top unit; all the power is on and the lights dim when the compressor kicks in, so do you think it needs to be rechaged?


Probably not. Does it trip right away or after it runs a while? Check all your wiring connections at the unit including under the compressor terminal cap. Make sure your fan spins free & is lubricated. The condenser on the roof top could be dirty. A capacitor on the compressor could be weak or failing. It is possible there is a refrigerant leak that caused the compressor to run hot and start to draw high current as a result though.

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1 Answer

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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.

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I am now having a seperate problem, the compressor is either locked up or has too much back pressure and trips off the service breaker when trying to start. The only solution I can see with my current problem is to replace the entire unit.

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