Question about Dometic Rooftop RV Air Conditioner

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We have a Coleman 7300 rooftop ac unit. When the

We have a Coleman 7300 rooftop ac unit. When the ac is switched on the compressor and fan both start working. After a few minutes the fan stops but compressor continues to run about 30-40 sec and shuts off as well. We can manually restart it after 5 min. Same thing happens again. Help!!! Thank you!

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  • steve
    steve May 11, 2010

    Check your capacitors.



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The fan motor is getting hot and going off on the internal overload in the motor.
This is caused by either a low voltage, a bad capacitor, or tight or dry bearings in the motor.
To check the bearings turn the power off to the unit, then spin the fan blade if it spins freely then the bearings are ok.
To check the capacitor you will need some kind of
tester or you can buy a capacitor and replace it, that's what a lot of people do. They usually don't cost very much.
To check the voltage you will need a voltmeter and measure the volts at the unit.

Posted on Jun 09, 2009

  • Steven ward
    Steven ward Dec 16, 2013

    The only thing that kicks off is the burners the blower motor stays on as well as the inducer motor



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If this is a 'new' unit I would contact Coleman and explain the problem you are having. I would think that they would have to honor the warranty on the unit. That is, if a AC company installed the unit. However, from your explanation of the problem it appears that you might of installed the unit yourself in which case - 'they' (Coleman) might decide to 'not' honor it. A gray area for sure. Still, I would try and see if they would help you.
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