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My Dometic rooftop Ac/heater runs for approx 6hrs then shuts down and then you hear a humming sound.Turn it off for approximately a hour or to turn it back on and it will work again.

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If it runs for six hours its not heating very well

Posted on Dec 10, 2016

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I have my dometic Rooftop ac unit. The heatstrip/fan run perfectly but when I turn on the ac...the fan runs good but when the compressor kicks on it just hums.


The compressor coming on does make a slight "humming" sound which is normal. Is the unit cooling properly? Do you think it is louder than before?

May 09, 2010 | Dometic Rooftop RV Air Conditioner

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My duo therm roof top camper air conditioner just shut off and will not come back on. Can hear a click when turning on now but nothing else. Note that heater will not come one either.


The click that you are hearing is the relay control board in the rooftop unit. This means that you are getting 12V to the board. It sounds like you are not getting 120V to the AC unit. Check the breakers in the breaker panel to make sure they are OK. If they are fine, then turn off the AC for 5 to 10 minutes and try again. There is a thermal protection device in the unit that prevents you from turning it right back on after a shut down. Try putting the thermostat to fan only operation. If the fan does not come on in fan only mode, then you have thrown a breaker.

Hope this helps,

Jeff

Jun 27, 2009 | Dometic Rooftop RV Air Conditioner

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Sounds to me like your fan is hitting something
Remove the cover and turn the fan by hand ( with the power off ! ) See what it is hitting

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