Question about Dometic Rooftop RV Air Conditioner

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Snapping noise then quits

AC runs for a while then starts making snapping sound/crackling noise then quits. After waiting 10+ minutes it will start again and may or may repeat the issue. It only seems to do this when the compressor is on, not when running the fan. When it quits, I can't turn neither back on. Thx.

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  • Rick Fleming
    Rick Fleming May 17, 2014

    Thanks for the response, it's a Dometic dual therm model# 457915.301 Its on a trailer that is a 2011 model year.

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  • 8 Answers

Not sure what model yours is, but sounds like you have a bad start capacitor that has dried up or swelled and "snapping" when making connection. If you can give me the Brand and model number I can see what capacitor you need.

Posted on May 12, 2014

Testimonial: "Thanks for the response, it's a Dometic dual therm model# 457915.301 Its on a trailer that is a 2011 model year."

6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

22yooper
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SOURCE: Compressor starts and doesn't stop

Relay for the compressor may be stuck ( Contacts welded) both the fan and the compressor should operate at the same time. Have the relay(s) checked and possibly replaced.

Posted on May 31, 2008

koolbreezes
  • 540 Answers

SOURCE: Hard Starting Dometic Rooftop AC unit

Just add a$10:00 hard start kit to the compressor.

Posted on Sep 07, 2008

  • 587 Answers

SOURCE: We have a Coleman 7300 rooftop ac unit. When the

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

  • 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

motor1258
  • 6674 Answers

SOURCE: A/c turns on for 10 minutes

If it was start up capacitors, it wouldn't start initially every time. Do me/you, a favor, and remove your filter inside (return air) , and if it's a ducted system, remove entire plastic cover inside. Take a flashlight & look way up where filter covers in hole & take a good look at cooling fins on evaporator (front of AC). Look for restrictions such as dust etc. That dust will turn just like mud on there due to condensation mixing with dust, and block off flow which could cause unit to freeze up & compressor to kick out. If your real ambitious, and find lots of dust there, taking cover off roof unit would be next, and check same there at back end (condenser) coils & cooling fins.Get back to me after inspection from inside. Could still be electrical but lets check that it has proper maintenance & best chance to work properly by doing this first.

Posted on Jul 16, 2009

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