Question about Dometic Rooftop RV Air Conditioner
I have a duo therm model 57915.531. I've used the fans often, and the a/c rarely.
The fans won't run, but a humming sound is coming from the compressor. I've checked the fuses.
This sounds like the same part is needed. Does that sound right?
I'm getting ready to camp for the month of August, and would love expert help.
I'm guessing the hum you hear is the fan motor. After sitting for a time, I've had many that develop like a dead spot in the fan motor. Here's what to try. Shut power off to AC. Get someone up on the roof with about a 2 ft.,long fairly strong stick, or rod , about 1/4 inch or so in diameter. Have them carefully poke it through the openings in the cover and spin the fan blades at the back end of it. May be a little stiff at first, so don't break blades on fan, but get stick under one & lift to spin it, or over it & push it downward. Spin it 2 or 3 times all the way around. Turn power back on. Now stand back & try fan mode again. 99% of the time that will do it, but if not, take screws off around cover on roof & remove cover & give fan a bunch of good spins by hand, then turn power back on & try it. Keep me posted on results please ?
Posted on Jul 12, 2009
Usually the humming sound from a compressor is followed by a breaker tripping or a fuse blowing, it is usually an indictor of a larger problem. If it is not tripping the fuses/breaker you may need to replace the start components (relay, start capacitor) if so equipped, if not equipped you may need to look into installing a solid state start assist, you will need to know the tonnage of your unit, and any HVAC parts house or appliance repair house should carry a generic start assist.
Posted on Jul 12, 2009
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Posted on Jan 02, 2017
Unit may pull as much as 17-18amps when compressor starts up, but level out to 12-15 amps when up and running. Keeping in mind that is all relative to proper 120v incoming voltage, heavy enough wire to run the application etc. If your AC unit needs cleaning , it may draw an extra amp or 2 . With that said, when your at the park, first thing I'd question is their incoming voltage to RV, and try running fridge etc and anything else on propane if possible. The AC alone should not cause 30amp at source breaker to trip, before 15 0r 20 amp breaker in RV that is connected to AC trips. If it doesn't trip your breaker at home, and all is connected same at park, then I certainly would suspect bad breaker or voltage/wiring at park is the cause. P.S. I noticed you said you have 12 gauge wire (rated at 20 amps) connected to a 20amp breaker at panel, but RV is plugged in to a 15amp receptacle, I will assume with a 15 amp adapter from 30 amp plug. Do you see any hazard regarding 15 amp rating on receptacle? ( just a little advice.)
Posted on Oct 09, 2011
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