Question about Dometic Rooftop RV Air Conditioner

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I have a dometic roof air on my RV, The start capacitor melted, i just received a new one from dometic,i orded the quick start kit,do it came with a start relay small black box that i dont remember seeing on my a/c unit, i do not have a generator, so do i still need to add that extra part?

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  • Dometic Master
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Yes. Use all the replacement parts. Your compressor is hard starting due to increased tork and wear. That is what burned out the original cap.

Posted on Jul 16, 2009

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1 Answer

The compressor in my roof ac in my RV never turns of and I have replaced the thermostat. What else could it be? Could it be the compressor relay or the capacitor? Or something else? THANKS IN ADVANCE!!!!


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It could be the capacitor, it could be a loose wire connection, it could be a delay switch or a contactor/relay.

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1 Answer

Roof air conditioner shut off


First inspect the plug blades. If they are dirty, black, melted or corroded, there's your problem. replace BOTH the plug and the receptacle.

Then ensure your power is adequate, a 100' 12 gauge extension cord will blow out a air conditioner in oh, right about two hours.. Use less than 50' for small, and 100' for 12 (heavy guage) extension cords.

Third, maybe your start/run capacitor is toasted from any or all of the above.
Discharge safely and replace the inexpensive capacitor from an online source or a local appliance service shop.

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I''ve been working on this thing for three weeks now. It is a Dometic Duo Therm model 57915.531 roof top ac on my rv. It will not run. This is what i have done so far: replaced the thermostat, there is...


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also check shorted to ground
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Compressor


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