Question about Dometic Rooftop RV Air Conditioner

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Replacing a fan motor in my Duo Therm air conditioner. Came with a capacitor that is smaller than original. Is this ok?

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It should not be a problem. Check the side of the capacitor and it should have a Microfared Rating on it. It has a symbol the looks like uF and then a number. Most of the fan capacitors are 7.5uF or microfareds. If it is the same or similar, then there is no problem.

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Posted on Jul 03, 2009


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Duo-Therm compressor does not turn off

I think you checked voltage across the run capacitor, the brown and white wires. The voltage to the motor would be on the black and white wires And inside the motor, a thermal protection device opens the black wire, leaving no potential voltage to the other voltage line nor capacitor line ( brown and white are the same line).
The solution, varify that the motor is wired correctly, then that the capacitor value is correct, not weakened, that the motor vent holes are not blocked or obstructed, that the motor amps are not exceeded, that the motor bearings have no side play and not worn.
Before replacing the motor, make sure the wiring is correct, the motor and capacitor are not good.

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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

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I'd have someone who's familiar with capacitors, (for safety sake), to test your fan run capacitor, and power to it. If capacitor is shot, fan won't start. Have to remove cover on upper unit, then cover on side at front where wiring is, to access it.

Jul 11, 2009 | Dometic Rooftop RV Air Conditioner

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