Question about Dometic Rooftop RV Air Conditioner

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A/c hums when you turn on. a/c ran before then when shut off all it does is hum

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Two things to check. One: look for the start capacitor and make sure it is not blown out the top or black and burnt. There is an anticipatory on top of the capacitor also that could have burnt out.
Then make sure nothing on the out side stuck the fan blade in place and not let it turn. That is really three things, But the charge is never the problem on Roof top air for RV's. Small amount in the system leaks out fast if line bad. AC unit has no taps because it is a closed system not designed to recharge. That doesn't you can't charge the system, it just means someone telling you to tape the line just to test pressure is not really going to fix the problem. Air flow and cleanness of unit on evaporator and condenser is important. You can hear the compressor running if is working. If fan not turning check for being stuck.

Posted on Jun 06, 2010

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Posted on Jan 02, 2017

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SOURCE: duo-therm mod # 57915 not cooling fan?????

need to get at the capacitor for the fan. Try spinning blower when it hums. If it runs then the cap is bad if not the motor.

Posted on Aug 14, 2009

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