Question about Dometic Rooftop RV Air Conditioner

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Why does my rv rooftop air conditioners blower motor come on and blows but then cuts off and only hums?

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THE CAPASITOR FOR THE FAN MAY BE BAD OR YOU MIGHT NEED TO OIL THE FAN MOTOR.. ETHER WAY YOU LOOK AT IT , THESE ARE NOT FUN TO WORK ON . BUT IF YOU CAN FIX IT YOURSELF . YOU HAVE SAVED A BUNCH OF MONEY !! BEST OF LUCK...OH TAKE PICTURES SO YOU KNOW HOW TO REASSEMBLE ..IF'N I WAS ANY HELP AT ALL PLEASE VOTE.. JAY

Posted on May 25, 2010

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I have a FEMA camper and my rooftop A/C makes a humming sound with no air flow. what do you think ?


Hi!!

It seems like the blower motorr is not kicking in. Turn breaker OFF, remove the grill, check that electrical connections are nice and tight, and turn breaker back ON, start unit and see if evaporator coil is gatting cold, if so, Turn Breaker off, remove blower motor capacitor and test it, if capacitor OK, blower motor needs to be replaced.

Good Luck!! Rate this Post!!

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Good chance Fan Capacitor is shot. Not very often motor itself goes. Might want to get a qualified tech to check it, as capacitors can give a real good, even fatal shock due to high voltage, and should be handled by experienced electrician, or AC service tech. $20-$30 part, and 1/2 hr. labor should be in the right price area.

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1 Answer

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If it does, then it is more likely that the compressor
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