Question about Dometic Rooftop RV Air Conditioner

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Run capacitor replacement for Dometic 57915.621

Need to replace the run capacitor for Dometic 57915.621

Posted by Anonymous on

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  • Dometic Master
  • 1,363 Answers

Check the old one & replace with same value in mfd. uf.

Posted on Aug 18, 2015

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Posted on Jan 02, 2017

motor1258
  • 6674 Answers

SOURCE: Rooftop RV Air Conditioner: replaced capacitor on dometic 59516-531 steal trip...

You need to borrow a clamp on style amp gauge, and check amp draw on black wire in box where hydro wires connect. (PLEASE, be careful, and if not experienced in this type of test, don't try it, due to likelihood of getting a shock. ) If it's the compressor kicking in that's causing the breaker to trip, and capacitor is good, then it's usually a problem with either low incoming (supply) 110-120 AC voltage, which will cause high amperage draw, or compressor on it's way out causing high amp draw. If it's only drawing 15-18 amps, and your tripping a 20 amp breaker, then breaker is getting weak.

Posted on Jun 05, 2010

heatman101
  • 43501 Answers

SOURCE: Dometic Duo-Therm Model 57915.622 Fan will not start.

Hi, Sounds like your fan motor has gone bad...
Here is a tip about trouble shooting your air conditioner...

Air Conditioner Trouble -Review the Possibilities
http://www.fixya.com/support/r3571569-air_conditioner_trouble_review_the_possi

heatman101

Posted on Jul 19, 2010

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2 Answers

Do you think it could be the fan capasitor?


if even after changing the capacitor the fan does not run on its own , so it indicates the weak fan motor .but before that check whether the bearings are chocked up ,sometimes even choked bearings cause this type of problem.

for any further queries feel free to ask.
thanks

Sep 18, 2008 | Dometic Rooftop RV Air Conditioner

1 Answer

Dometic roof air compressor comes on but fan will not replaced both capacitors and thermostat


Sounde as if there is an open winding in the fan motor. There are two sets of windings in a fan motor. The start winding and the run winding.

Here is how you can tell if it is the start winding. Put the unit on and then take a stick and try turning the fan swiftly. If it does start and it could be in either direction, since you have already replaced the capacitors then if the start winding is open then you will need to replace the fan motor. Same goes if the run winding is open.

Apr 14, 2014 | Dometic Rooftop RV Air Conditioner

1 Answer

Need part number for run capacitor Duo therm Model 600315.103


You can get capacitors from any electric motor repair/rebuild shop if your capacitor is a 3 wire it will be a 5uf 30uf capacitor the fan motor runs off the 5uf the compressor runs off 30 or 35uf it will also have 440v 330v ect under the 5uf or 30uf this is the voltage as long as the replacement capacitor is within 5% it will not hurt anything. Capacitors usually run 5 to 15 dollars at a repair shop much more from duo them. good luck

Aug 08, 2010 | Dometic Rooftop RV Air Conditioner

1 Answer

I''ve been working on this thing for three weeks now. It is a Dometic Duo Therm model 57915.531 roof top ac on my rv. It will not run. This is what i have done so far: replaced the thermostat, there is...


check the compressor winding resistance from common to start
start to run
run to common
the two lowest should equil the highest
also check shorted to ground
check the capacitors the go bad a lot

May 16, 2009 | Dometic Rooftop RV Air Conditioner

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