Question about Dometic Rooftop RV Air Conditioner

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Dometic roof air the compressor comes on but the fan wont run. changed out both capacitors and thermostat. fan turns easy up on top, dont hear any clicking coming for control box. any help would be ap

Im leaning towards the control box replacement or the motor has a open circuit this is adometic roof air model #57915-341e9

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  • Dometic Master
  • 1,363 Answers

Either the cable between t-stat or rely module board.

Posted on Aug 16, 2015

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6 Suggested Answers

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Posted on Jan 02, 2017

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  • 49 Answers

SOURCE: duo therm roof top a/c

Sounds like 1 of 3. Blower motor capacitor, relay or thermostat. Try to run fan only if that is an option and see.

Posted on Jun 01, 2008

  • 230 Answers

SOURCE: will not shut off

Sounds like a stuck relay on the unit itself. Maybe there is a short in the control wire that comes from the thermostat that activates the fan.

The thermostat probably has one hot wire at all times. The thermostat then chooses which wire to send the voltage down based on your selection. One of those wires is probably for the fan only. Make sure that it is in good condition (no bare, pinched or wires)

Posted on Jun 17, 2008

jmeredith
  • 417 Answers

SOURCE: compressor tries to start but want

hi,
you have to run a contractor grade extension cord(10-12 gauge) from your rv to run those or theyll do that, the lower the gauge the better, best bet is to plug the rv directly into the outlet, if you cant, get the shortest and thickest extension cord you can.

Posted on Aug 21, 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

  • 116 Answers

SOURCE: I''ve been working on this thing for three weeks

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

Posted on May 17, 2009

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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.

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Duo therm roof top a/c


Sounds like 1 of 3. Blower motor capacitor, relay or thermostat. Try to run fan only if that is an option and see.

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