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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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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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

Air conditioner hum often

Is your AC unit a wall mounted unit or a cassette ? And do you know if it has a pump fitted or if its gravity fed drain system

Jul 08, 2012 | Goodman 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

My outside ac unit seems to have a low voltage hum coming from it. The ac unit works fine. I turned the thermostat off in the house and it stopped. Is this a problem? Is it sucking electricity the entire...

That is most likely the control transformer - it drops the 240vac to 24vac for the thermostat, and the run contactors. The transformer may have a loose lamination - not a problem, unless you are bothered by the noise.

Apr 23, 2010 | Superior Lennox Blower Thermal Sensor -...

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

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