Question about Dometic Rooftop RV Air Conditioner

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

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  • gregf145
    gregf145 Feb 18, 2013

    Thanks for all the ideas. I am still working on it as a few things came up.

  • gregf145
    gregf145 Jun 07, 2013

    Thanks for all the ideas. I replaced the circuit board and run capacitor. It appears the compressor is shot. While monitoring the voltages, the compressor works, providing cool air. The lines are all iced up and everything works fine, for about 10 minutes. At that point the compressor starts pulling a bunch of amps and stops cooling. When testing there is 115v through the thermal cut/off on top of the compressor while it is cooling. But then the voltage is pulled down by the compressor. If I disconnect the hot lead at the compressor, line voltage returns to normal. The compressor then has a grounded circuit. Thanks Gregf145

  • Duncan Lawrie Aug 10, 2013

    sounds to me like your gas has leaked out

  • gregf145
    gregf145 Aug 26, 2013

    THE REAL PROBLEM IS: The bearings in the compressor are shot and after running for a few minutes, they get hot and freeze up the compressor. Thanks for all the ideas. With a defective compressor, it makes no sense to try and fix it.

  • gregf145
    gregf145 Jul 14, 2014

    My trouble with the air conditioner was burned out bearings in the compressor. After running a few minutes, the bearings would freeze up. The voltage would drop to near nothing and the amps went sky high. As it acted shorted out.

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  • Dometic Master
  • 6,674 Answers

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.

Posted on Jan 27, 2013

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Posted on Jan 02, 2017

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  • 587 Answers

SOURCE: RV air conditioner. Compressor running, fan stops before cool

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

  • 332 Answers

SOURCE: COMPRESSOR

Thermostat is bad
Replace it

Posted on Mar 06, 2010

  • 230 Answers

SOURCE: dometic roof air

Sounds like the unit either has been miswired from the beginning or there is a stuck contactor relay.

The more rare scenario is that the control wire between the t-stat and the contactor is shorting to a power source causing the relay to energize. Good Luck!

Posted on Jun 23, 2008

  • 92 Answers

SOURCE: 57915-341G9 AC. unit is tripping the 20amp breaker

Sounds like the compresser is bad,I have seen a freon overcharge also do this-but it is rare.

Posted on Sep 09, 2009

  • 415 Answers

SOURCE: AC compressor will not engage

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

Posted on Mar 31, 2010

Testimonial: "You gave us a couple extra ideas than what we already thought of checking. Thank you. We will trade out parts from working one, see what it is. Thanks"

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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.

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