Question about Dometic Rooftop RV Air Conditioner

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Compressor dosen't restart

Compressor runs, cools down some, cycles off but won't restart. amp draw is 10.4 when it tries to restart. Changed temp. switch on compressor but still won't restart. Any ideas?

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  • Dometic Master
  • 1,363 Answers

Replace capacitors might be going off on safety.

Posted on Aug 18, 2015

6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 10 Answers

SOURCE: DuoTherm rooftop compressor problem

What you are telling us is called shortcyling is caused by possable low refrigerant then the electrical overload is stopping the compressor. overheating can accure.it is best a local serviceman can check it to prevent major part damage.pressure and oil safey controls can cause
simular cylcling problems.

Posted on May 02, 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

  • 82 Answers

SOURCE: a/c is drawing 20 amps and keeps tripping breaker after running

If the fan is running and the compressor is getting hot and tripping off you may have a failed capacitor.

Posted on Jun 29, 2009

  • 88 Answers

SOURCE: AC compressor won't start

hi,you might need a new compressor...you will need need to go back were you bought capacitor...buy a hard start capacitor too..this might crank the compressor...hope this helps.if you buy it..call an ill tell you how to wire it...if it dont ,you need new compressor...call michael..doctor airr..appl.repair...843-384-8474...

Posted on Mar 28, 2010

  • 1 Answer

SOURCE: Penguin model 610012-001a/c compressor won't start

I have a clicking in the fan. It appears to be the squirrel cage fan touching the side of the cage. It is worse on high fan speed and very irriating. What can I do?
Rush

Posted on Jul 27, 2010

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1 Answer

Duo Therm A/C (2009 Sabre RV) won't shut off


bad compressor relay on control board. The relay is not opening the circuit, allowing the compressor to stay running when unit is turned off. This overheats the compressor and opens a thermal disk shutting the compressor off. When thermal disk cools down, the compressor restarts under load and trips breaker.

Jun 06, 2013 | Dometic Rooftop RV Air Conditioner

Tip

Checking out a air conditioner compressor and compressor problems FIRST...


Checking out a air conditioner compressor and compressor problems
FIRST DISCONNECT ALL ELECTRICAL POWER
Ohm the windings
C to R = example 1.2
C to S = example 3.2
R to S = example 4.4 total of C to R and C to S or very close.

Then ohm each terminal to ground you shouldn't get any reading
If the compressor is hot or you tried to start it, the ohms will be close but not exact.
No reading from C to R or C to S open winding or thermal overload.
Let compressor completely cool down then ohm the C to R and C to S again
If it’s an open overload, you will get an ohm reading after it cools down and the overload closes,
you may just need to add refrigerant.
No reading from R to S and C to S open start winding.
In case of any open windings the compressor will have to be replaced.
If the compressor is getting the proper voltage and won’t start, it could be locked up.
You need an Ammeter to check this to see if it’s drawing locked rotor amps (60 amps or above)
You also need to check the run and start capacitor.
A bad run or start capacitor, the compressor won’t run, it will just hum.
If the compressor will run, but quits after a while and all of the above checks out OK.
It could be drawing high amps ( you will need an ammeter to check this out). Dirty condenser or condenser motor not running, overcharge of refrigerant, shunted windings, bad bearings in compressor.
The compressor gets hot and Suction or big line coming in to outdoor unit is warm or slightly cool, you are low on charge or metering device bad or stopped up.
If compressor runs for a while and quits and the suction line is frozen, cold or cool, then the filter, evaporator or condenser coils are dirty or plugged up, blower or fan motor not running and unit going off on high or low pressure switches.

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I have a 7 year old Goodman. The indoor unit blower keeps cycling on / off (it will run 5 to 10 mins them cycle off). The house is 81 degrees and the t-stat is set at 70; the condenser unit is compressor...


Make sure the capacitor is the proper microfarad rating for the motor you have. Sounds like the motor may be drawing too many amps and dropping out on it's overload when hot, then when it cools it turns back on.

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For the past two days I have had to reset the main circuit breaker for the outside unit. It appears to be running fine now. I'm just wondering is this an indication of the compressor about to go bad,...


Bill, first thing, make sure the outdoor coil isn't stopped up with dirt. This will cause the compressor to overheat and possibly trip the breaker. If you you can check the amp draw that would be good. Look on the data tag on the outside unit and look for RLA or "running load amps". Running amp draw should never exceed this number, it should actually normally run 10% under RLA. If its real hot where you are like it is here (109) it will be running close to RLA.
If you coil is stopped up with dirt, etc., turn off the breakers, use you water hose and sprayer and carefully wash out the coil.
If all this fails, and your amp draw is good, change your breakers. Hope this helps , stay cool.. Mark

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You are cycling on the compressor overload, meaning the compressor is drawing excessive amperage, the overload takes it out then it cools down and tries again. the normal amp draw for those compressors is 3-4 amps. Have you checked the condenser fan and made sure the coil is clean?
unfortunately those compressors cannot be serviced

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When the compressor first starts up it can draw as high as 15 amps but for no more then a second or two. After that it should run at 1-1.5 amp and will draw less as it continues to run. After 10 minutes it should pull anywhere from .5-1 amps.

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COLMAN TSR


3000 Watts is a little short on the power necessary for the compressor to restart. When it compressor starts it may draw 27 amps or more for a split second. 3000 / 120 = 25 amps. when the fan slows down it is telling you the voltage has dropped and it doesn't have enough power. After the pressure has balanced out in the A/C system the compressor can start against no pressure difference.

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