Question about Dometic Rooftop RV Air Conditioner

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The fan of my ac home unit, doesn't start. I hear the noise and the fan start moving slow but doesn't go thru. I rmove the fuse, make some rounds to the fan, after that I plugged the fuse,and sarted working and cooling normal. but after 2 hours, stop and I've the problem again.

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  • ruben4life Jun 26, 2009

    Absolutely right.
    I am working to fic the unit.
    Sincerely
    Ruben

  • ruben4life Jun 26, 2009

    Absolutely right.
    I am working to fic the unit.
    Sincerely
    Ruben

×

1 Answer

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  • Master
  • 1,734 Answers

Most compressor units have a double capacator . If one half goes bad, either the compressor will run without the fan, or vice versa. Those big capacitors can be nasty. First step on any system with capacitors is to short them out. Use a plastic handled screwdriver. Touch a blade to one terminal of the capacitor and pivot it to touch the other. Do that with each one. Mid range Multimeters do not work well checking capacitors. Best thing is a good one with a capacitor checking function. Follow directions. With a cheap analog meter, put it on ohms and connect the leads while watching the meter. The needle should swing toward 0 initially and slowly creep back to infinity. Most air conditioners have a double capacitor in one case. It is almost quicker to check both than identify the one for the fan. If the motor turns freely and does not look obviously burned and the capacitor checks bad, likely it is bad and may well be worth replacing even on such an old unit. An Dometic dealer or an electrical supply house may be the best place to check for a new one. Just take the the old one in and let them match it up. I am not sure about that SuperBoost (brand name) relay and hard start capacitor. If it is bad, try removing it, and see if starts without it. Otherwise, maybe a friendly supply house will help you.

USA
SERVICE OFFICE
The Dometic Corp.
2320 Indust. Parkway
Elkhart, IN 46516
Phone: 574-294-2511

CANADA
Dometic Corp.
46 Zatonski, Unit 3
Brantford, ON N3T 5L8
Canada
Phone: 519-720-9578

Posted on Jun 26, 2009

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