Question about Dometic Rooftop RV Air Conditioner

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I replaced the fan motor in a coleman rv 13,500 a/c and wired the same but the motor is running in reverse then stops after a minute.

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If you are 100% sure the wiring is correct,,
It might be the capasitor..

Posted on Jul 22, 2009

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Remove green (fan run) wire from thermostat, and connect to red wire (power) and see if fan runs, and if it will stay running. That will by-pass thermostat to see if it is problem. If it continues to run, thermostat is problem. If that doesn't cure it, I'd remove cover up top and with power off at circuit breaker, blow compressed air in to motor air holes to make sure it's getting proper air for cooling, as well look for small plastic plug on housing where oil can be added ( few drops) to lubricate motor. Leave cover off and try fan to see if that may help. If at all possible, a clamp on amp meter will confirm if motor or relay is at fault if none of these suggestions help. If amp draw at motor too much, motor may be seizing when warmed up from running. test draw when first started and after running for amount of time that it usually quits, and if noticeable difference, motor is seizing and needs replace. You can also test amp draw at main 120v feed wiring with unit just in fan mode.

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Fan not blowing in coleman trs rv roof air


well check a few things first....have someone remove the cover and reach in with a hand and try to manually spin the blade...free spinning?....then tell the person below to click in the on postion while someone views from up top.....is it humming? or even trying to spin?....if not check the fuse on the RV that protects the A/C unit.....good?.....now replace the capacitor ( it the silver or gray can looking thing that the motor wires run to) only the correct size will work w/o causing further motor damage.

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Hi, this is strange as I have never heard of this either!!! The capacitor is located by the motor and sometimes clamped to the motor. They can be the shape of a very small can, oval 3" tall with 2 leads on top with wires coming off the terminals. It could be chrome in color, or made of hard plastic. It may have 3 terminals on top, with several spade connectors on it.When you find it, mark all wires and draw a picture or you will not remember how it hooked up.Try and get the same one. Keep me posted and I can help if you need more. Strange thing going on here??
Shastalaker7

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It sounds like you have a bad fan capacitor.
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This could be the problem. It is more likely that the motor bearing is bad. Take the fan capacitor and have it tested. Or replace it, (under $20). Was the fan motor loud before this happened? Hopefully it is just the capacitor, the motor runs $60 - $100 and is a FUN to replace.

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