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Our central air conditioning unit is out. The outside unit makes a straining noise but the fan does not turn. I can manually turn the fan blades.

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Sounds like a start run capacitor. The motor may be bad too. The capacitor will look bloated if it is bad. There may be other reasons for these parts to fail. So please call a licensed technician for professional help.

Posted on Jun 17, 2008

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I have a Ruud Zepher Serris Central A/C & Heat unit - forced hot air. I cleaner the dirt and debris out of the outside unit put back together and now the outside unit will not start. There is power...


if you have power to the outside unit and the fan is not turning - the most likely problem is that the fan motor is bad. I would make sure the power is all OFF and then try and turn the fan blade by hand. If it's stuck and will not turn or turns 'hard' - the bearings have gone out and the only fix is to replace the motor.
If the fan blade turns freely - then you might check the capacitor (small electrical device attached by wires to the fan motor) and see if all the connections are tight and complete and that the capacitor itself is not bulged.
If it's 'bulged' that is a good indication that it's bad and that could be your only problem.
Otherwise I would either change the motor myself (if the bearings are out) or get an AC Tech to troubleshoot the system.
Hope this has helped.

Aug 05, 2011 | Ruud UAMB042 Air Conditioner

1 Answer

Our unit is making loud clicking noise and spraying water when in the cooling air condition mode, but not when the fan is on. What could be the problem, and is it fixable?


you may hear water splashing that is because it is coming off of the condenser the part that is outside the water runs off the condenser and is forced out by the fan for as the noise could be something in or on the inside fan blade or outside fan blade as long as the water is not coming inside your house and you have enough slope on the unit you should be ok

Jul 04, 2011 | LG Electronic Window Air Conditioner

1 Answer

Lennox central air for home not kicking on. Fan on the outside not spinning but motor is making a humming noise. No cold air coming in home. We have circuit breakers they are turn to the on position. ...


Is the indoor fan working? The problem with the outdoor fan sounds like it could be your capacitor. Turn off the power to the outdoor unit and make sure the fan turns freely using a screwdriver or something that will reach the blades. If it turns freely then it is probably the capacitor. Let me know what you find.

Aug 25, 2010 | Goodman CLT36AER36 Air Conditioner

1 Answer

I need help with a buzzing sound in my air conditioner.


It is probably the compressor humming. They can make some funny noises especially on start for a while. If the unit is not cooling it may be the start capacitor or the comressor may be locked up.

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On tempstar heatpump the outside fan makes a loud noise


Well, that could mean a lage list of problems from which to choose, 1st I suggest you isolate the fan to be sure it is the problem; Hopefully you have an outside disconnect box for the unit, stop the power at this discoonnect and wait 3 minutes. Place a large stick or metal bar throught the topgrill to hold back the fan blade from turning. Now connect the energy at the disco box ( you may want a second person so you can hold the stick in place). You will not harm anything by holding the fan from turning for a short time. If you hear the noise that you suspect after the unit runs for 20 seconds, then the problem is most likely the compressor. If you do not hear the noise, then remove the stick and aloow the fan to turn. You at this point should be able to see if the blade is clangging, or the blade is imbalanced and vibrating, or the noise is coming from the fan motor itself. The most likely problem is the bearings of the fan motor are worn and the motor is screaching or laboring; in which case you need a new motor unless you are savy enough to replace the bearings in the motor (however, this is not always cost effective unless you really know your stuff). Check the blade for fatigue fractures in the metal and check the mounting points that hold the motor in place-----sometimes these mounting points also fatigue after years of vibrating and need to be reinforced with oversize washers or the entire top grill piece needs to be replaced if the cracks are too severe. Goodluck, Macgivor

Jan 02, 2010 | Ruud Central System Air Conditioner

1 Answer

Air Conditioner Compressor Fan Quit


Check the start capacitor. You may be able to see visual deformaty, otherwise, use a meter. The buzzing is most likely the contactors closing which uses a seperate 24v supply..

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This is nothing but an either or -or ! First, make the thermostat calls for cool, there are suppose to be 2- noise outside, the fan motor and the compressor (and if a old system,a humming noise which is the contactor coil which picks up the main 240-volts).. hurry up and take a stick or something and turn the fan blades, if it picks up speed and run, then its the capicator. If not then the fan motor is bad.! (BOTTOM LINE)!

Jun 09, 2008 | Heating & Cooling

1 Answer

AC make loud noise on power off.


Is this a wndow unit or central air system? if this is a window unit , your problem is it only needs cleanning (dirt dbber nest-- trash around the back blades-- or the unt is twisted and rubbing the fan shroud. Last but not least, the slinger ring around the back blades (a ring around the end of the blades thats picks up water in the bottom of the unit and sling it on the coils to help cool the hot gases....Thank-you Thank you Thank you very much!

Jun 02, 2008 | Heating & Cooling

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