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I have a dometic roof top a/c when I turn it on the compressor make a noise and shake a little for a second but it doesn't start after 30 seconds it try again but it doesnot cool at all, it keep doing this until I decide to turn it off, thank you for your help

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  • filadelfia02 Jul 16, 2010

    I did put a new capacitor

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It's either low on refrigerant and the low pressure switch is keeping it from starting, or the compressor doesn't have enough juice to start on it's own, which might need a new start capacitor.

Posted on Jul 16, 2010

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hi,you might need a new compressor...you will need need to go back were you bought capacitor...buy a hard start capacitor too..this might crank the compressor...hope this helps.if you buy it..call an ill tell you how to wire it...if it dont ,you need new compressor...call michael..doctor airr..appl.repair...843-384-8474...

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I have an old type roof top a/c unsure of the model or make no tags. It starts and runs for about 60 seconds then stops but the compressor still runs. I replaced the run capacitor with no luck.


You might try removing the cover on the compressor where the wires hook up and see if there is a little black overload, usually the common wire is connected to it and then there is a wire from it to the common terminal on the compressor. If you have one of these overload protectors they can get weak or the wire can be loose causing a high amp draw.

Jul 24, 2009 | Dometic Rooftop RV Air Conditioner

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Fan stops turning after about 30 seconds


this sounds like one of your capacitors has failed
using an insulated screwdriver and, power not applied remove the spade connectors from one of the capacitors then short the capacitor to ground to discharge it replace the spade connectors apply power and, turn it on if the problem changes replace the capacitor (a bad capacitor usually is "bulged")
there are usually two capacitors a run and, a start

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Have Duo Therm roof mount A/C. Fan runs but when compressor tries to come on it just has a hum sound for about 10 seconds then after a short period of time it tries again but will not kick on


It sounds like the compressor is locked up. You can try a start boost or hard start kit but once this starts the compressor is on it's way out.

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Compressor tries to start but want


hi,
you have to run a contractor grade extension cord(10-12 gauge) from your rv to run those or theyll do that, the lower the gauge the better, best bet is to plug the rv directly into the outlet, if you cant, get the shortest and thickest extension cord you can.

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