Question about Dometic Heating & Cooling

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My new rooftop dometic ac is unbelievably loud. Mind u, I've been using fans with windows open,prier. It's hot now. we installed , doesn't vibrate ,just loud!

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  • Dometic Master
  • 1,363 Answers

Might have to remove cover on roof to isolate noise.

Posted on Aug 19, 2015

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Posted on Jan 02, 2017

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  • 127 Answers

SOURCE: Compressor doesnt come on in a dometic duotherm

If this is a wall thermostat controlled unit, then check to make sure that you have power coming from the yellow wire on the thermostat when it is placed in the Cool/Auto High mode. If you do not have power at the yellow wire, then you have a bad thermostat. If you do have power, then remove the control unit from the inside of the AC and see if you have power at the Y terminal there. If so, when you turn the thermostat to cool, can you hear a relay clicking in the box? If not, then you have a bad control box. If the relay is clicking, you need to check the power at the compressor relay on the board. It has a black wire to one side and a purple (or blue) wire on the outgoing side. Check to see if you have 120V on the blue wire when the tstat is set to High/Cool. If not, then you need to bypass the freeze switch to make sure that is not the problem. If you do, then you need to go upstairs and check the start capacitor for OK. It is located in the side compartment of the upper unit, it has a small black relay on the top called a PTCR. These often burn out and will cause the compressor not to work. If that is fine, then you go to the top of the compressor to the thermal overload switch. See if you have power at both sides, if so, then you have a bad compressor. If not, then the overload switch is open and not allowing power to the compressor.

Posted on Jul 04, 2009

SOURCE: I have my dometic Rooftop AC unit. The

Let it cool off.Install a hard start kit on the run capicator.Its only 2 wires & easy to put on.It should kick over.

Posted on Mar 16, 2010

  • 59 Answers

SOURCE: How to identify the btu of rooftop AC unit

ANY # DIVISABLE BY 12. MODEL HAS  12-24-30-36-40-48-54-60 12 1 TON 24 2 TON 30 2 1/2 36  3 TON 36.00 BTU 40 3 1/2 48 4 TON 48.00 BTU 54  4 1/2 60 5 TON   60.000 BTU

Posted on Apr 21, 2010

motor1258
  • 6674 Answers

SOURCE: I have my dometic Rooftop AC unit. The

The compressor coming on does make a slight "humming" sound which is normal. Is the unit cooling properly? Do you think it is louder than before?

Posted on May 09, 2010

MOTORWIZJ
  • 1340 Answers

SOURCE: 2007 dometic Rooftop AC "high-lo" switch. What does it do?

YES WITH OUT A DOUBT .. DO NOT TRY TO RUN IT ON HIGH IT MAY DAMAGE YOUR GEN SET ... HELP ? PLEASE VOT

Posted on May 28, 2010

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Go up on the roof of the unit and remove the AC Shroud. With the unit running, see if you can pinpoint where the sound is coming from. The only thing on the entire AC that would make that much of a vibration would be the fan motor. Not sure what would cause the fan motor to do this. The compressor may do that but only if the windings are bad and then it would not be cooling.

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