Question about Dometic Rooftop RV Air Conditioner

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My dometic mdl #620215.321 , fan comes on ,compressor comes on ,it gets cold, and then compressor shuts off and trys to come right back on but it kicks the ac voltage down and then trys again to come back on.it does this over and over

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  • Dometic Master
  • 4,292 Answers

Bad capacitor or motor

Posted on Sep 15, 2017

6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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

  • 68 Answers

SOURCE: My Dometic 620315 Penguin roof a/c does not produce cold air.

If the compressor is running with no cold air the unit is more than likely no good. It can not be recharged. you need a new unit. If the compressor is not running you need to check the capacitors.

Posted on Mar 19, 2009

  • 24 Answers

SOURCE: During low voltage period window AC compressor shudders and kicks off, but fan runs, when voltage returns normal compressor runs.

low voltage issues causes higher amp draw and equipment to run a lot harder. whats causing the low voltage problem to the equipment? high amp draw of the compressor could be causing it to overheat and trip until the compressor physically cools down.

Posted on May 27, 2009

  • 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

motor1258
  • 6674 Answers

SOURCE: My Duo-therm Brisk-Air by Dometic rv ac wont cool.(The fan runs )

Usually just listening closely will give you a rough idea where to look for problem. When you have the fan on and switch to cool, (with temperature turned down low obviously) do you hear any type of "moaning" sounds from AC unit, or see lights in RV dim slightly indicating that compressor is trying to engage? Is the breaker tripping when compressor tries to engage? Do you hear a "click" from AC unit when switched to cool? If none of that happens, then I'd start thinking thermostat, or compressor relay. Normally if it's a faulty capacitor, the compressor will try to engage but will make a "moaning sound" and usually trip the breaker due to excess current draw. Someone experience in electrical should be able to test relays etc, but whoever does work on it, should be aware that those capacitors, as well as hydro in general are very dangerous to work with. The ("zap",- Shock) that you can experience from a capacitor or hydro, can be fatal.

Posted on May 30, 2010

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Jun 26, 2014 | Dometic Rooftop RV Air Conditioner

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Refrigerator RM2652 was bought in 2005, it quit on us.Does not freeze or get cold anymore....Why, is it possible that it is low on freon. Is it possible to add some!!!!


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Nov 14, 2009 | Dometic RM2652 Refrigerator

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Blows cold but shuts down no freeze up


Check the capacitor. It should be a dual capacitor , runs both compressor and fan. This sounds like your problem only because both the compressor and the fan go out together. Good Luck Hope I helped

Dave

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Dometic RM7291L not effectively cooling on 240V but fine on gas


On the back of the unit, at the bottom, there should be a panel that is removable. Inside should be a fan, the condenser coil, and the compressor. The fan has to be constantly blowing air over the condenser coil, to dissipate the heat (which it is essentially being removed from the refrigerator by the compressor)

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Jul 28, 2009 | Dometic RM2620 Refrigerator

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Jun 02, 2009 | Dometic Rooftop RV Air Conditioner

1 Answer

Air conditioner will come on- fan motor is working- it sounds real low- it was on and then it shut off- waited a good 15 min. and cut it back on- it then started this problem


need more info. Is the fan actually on full force or does it feel like the air flow is restricted (could be dirty coil or filter)

Is the fan on full force but only warm air coming out (compressor not working)

Is the fan on but only cool not cold air coming out (freon leak)

The more info you give the easiest it is to troubleshoot from here.

hope this help

Benge007

May 27, 2009 | Dometic Rooftop RV Air Conditioner

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