Question about Dometic Rooftop RV Air Conditioner

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Compresser will not kick in and there a electrical smell

The AC (Duo-Therm Model 57915.622) in my RV has been working great until today. All of a sudden, the compressor would sound like it was kicking on, but then just hum for a few seconds, and then kick off. When this occurred, I can smell a slight electrical smell coming out of the AC vents in the ceiling. About 10 seconds after the compressor kicks off, it tries to kick on again and repeat the same cycle.

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  • Anonymous Jul 28, 2008

    have just experianced the same issue with same unit. Took it to a dealer refered to on their home page and was told that a relay or conductor of some type is the cause of it and the factory is aware of the problem and is providing the part free of charge. Am still waiting for the part to come in to see if that really is the issue. Hope this helps.

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Sounds like your start capacitor may have gone bad. If you remove the shroud, there should be an access panel for the electronics. In there, you'll see one (or two) cylindrical parts with wires coming out the top. If one of them shows signs of something coming out of it, it's probably your start capacitor and it needs to be replaced.

You can view the installation/service manual for DuoTherms here at Bryant RV.com (it's a 3MB PDF file, so download with care). Look on page 28 for info on the capacitors.

Posted on Oct 13, 2008

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Stop it!

Something has gone wrong and needs to be repaired. It's an electrical problem. The more you smell it, the more stuff is getting burnt. Take it apart and look inside it. Then restart it. The burning stuff will lead you to the bad part.

Posted on Jul 27, 2008

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2. If you've just had the compressor serviced including recharging the system, it's possible that the system is simply overcharged. This will stop the compressor from working and giving you the same symptoms as above. If this is the case, you should have the service people come back with some guages and recover some of the refrigerant and the compressor should be fine.

3. If the unit has been sitting and there is a slow leak then there is not enough pressure in the system to allow it to run. The compressor will shut down if there is not enough pressure, but since you say there is a smell, i really doubt this is the case.

Most likely it's #1 or #2 above. If you haven't had it serviced recently, then yeah, it sounds like you're in need of a new compressor.

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