Question about Dometic 57915531 Air Conditioner

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Fan just hums will not operate

Unit will not run at all on ac or fan only settings, just hums.

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  • 340 Answers

Bad capacitor or bad motor try the cap first as long as the motor turns freely if it does not then replace both standard practices good luck Tom

Posted on Jun 28, 2009

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Posted on Jan 02, 2017

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1 Answer

Outside unit will only run for a short amount of time with A/C before the fan stops turning and starts humming, squealing/screeching and the top of the outside unit gets hot.


The bearings are bad in the motor and after the fan runs enough it eventually gets hot, making the bearing screech and the fan locks up. Need to replace motor again. See if it has a warranty. The reason it gets hot is because the fan is what removes the heat from the coil and if the fan isn't running there is nothing to cool it off so to speak.

Apr 19, 2016 | Heating & Cooling

1 Answer

Is there a reset button on a FASCO D9709 AC unit?


Hello, the fan in the interior unit takes a few minutes to start in heating mode.
If you are talking of the fan in the exterior unit, then that fan is stuck or burned.
If you try to use in cold mode and the fan of the interior unit dont run, then you have problems in the electronic board.

Sep 15, 2014 | Heating & Cooling

1 Answer

Fan wont run on auto


Make sure your tstat is programmed for electric, not gas. Or in the settings you want that the TSTAT CONTROLS THE FAN.

May 23, 2017 | Dometic Rooftop RV Air Conditioner

1 Answer

When switched on it runs for few minutes and then switch and displays error code E3


Hi Perhaps after you switch the AC on all that is running in the first few minutes is the indoor fan. Be aware that all AC's have a start delay on the compressor as a protection device for when the operator is having a little fiddle with the controls. The delay is usually 3 to 4 minutes and occurs every time the compressor is stopped and goes to restart. The error code probably occurs when the outdoor unit goes to fire up. The problem may be a number of things. I assume that you dont have a list of fault codes, so here are a few things to look for. 1) Is the unit 3 phase? If so make sure you have all phases supplied. If that is OK check the outdoor fan operation and capacitors. 2) If the system is single phase, again check the operation of all fans and capacitors, 3) If they are ok check that the compressor actually runs. It may only hum but not spin up.. If it only hums, the capacitors may be crook or compessor jammed. If the compressor seems to be dead, ie: no response, no humming, no turning. I guess it will cost you, so call a serviceman. Again much depends on the type and model and the problems may be simple or extensive, If you are not trade qualified or experienced keeping your little fingers out of the thingo would be a real good move. However a good pair of ears can tell you much. Good luck

Feb 23, 2011 | Carrier 38CKC042 Air Conditioner

1 Answer

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

1 Answer

RV Rooftop AC Unit


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

Oct 24, 2008 | Dometic Rooftop RV Air Conditioner

1 Answer

Window AC unit


See if your motor is okay 1st. Find your wires feeding your Fan motor. (This means the 2 power wires L1 & L2 if 220v or L1 & N if 115V) Carefully put the power to these 2 wires and see if you hear the motor hum or start. If it hums the run capacitor could be bad.Try spinning the motor with the power applied. If it starts most likely the run capacitor is out. If it starts without you helping it the control board or switch is most likely out.

It is possible the unit has a energy saving setting. If it gets locked into this the fan may not run.
If the unit has electronic controls and an electronic display read out, the board is the most likely suspect. Unplug it and see if it resets.
If not then the board is probably out with a stuck relay or stuck program. New board time. Or replace the unit.

If it has a rotary or push button type control then either of these 2 switches are suspect.

Jul 12, 2008 | Fedders AEQ07FBG Air Conditioner

2 Answers

Outside unit will not operate


Sounds like a bad fan motor. Inside fan runs, compressor runs. Outside fan. Are your contactors pulled in when thermostat set on cool? If not might be a contactor. If contactor not pulled in touch the top of it with the end of a screwdriver. If fan spins turn unit off a buy a contactor...

Tip: Always make sure power at disconnect is off

Jun 10, 2008 | Carrier 38CKC042 Air Conditioner

1 Answer

Sharp Air Conditioner. Model # AF-S85NX. Does this A.C. fan cycle on & off in the auto cool mode or does remain on continuously. I need a small A.C. that cycles off and on with the compressor.


If you set you r AC to FAN mode the unit will not cool, it only runs in the indoor but the outdoor will off. If you set to AUTO the unit will cool but the indoor blower will automatically run slower when the room is cool or attain the room temp. setting. If you set it to COOL the fan speed is fix depending on your setting and it also operate in cool.

Apr 19, 2008 | Heating & Cooling

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