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Central air unit condenser fan overheats and shuts the unit outside.

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Replace the capacitor first but most likely the windings in the fan motor are burning up if there is a oil port on the motor add some but i think you will just need to replace motor hope this helps

Posted on Sep 29, 2009

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1 Answer

Fan condenser unit wont run


This is usually a bad capacitor or bad fan motor. The capacitor is located inside the electrical panel on the outside unit. You can check these by using a meter that measures Mfds (Microfarads), most of the time you can visually see the capacitor swollen or blown. The fan motor can be checked by a meter that measures ohms, really high ohms are usually bad. If you can't spin the fan blade easily, then it's locked up. What usually happens, the capacitor or motor windings go bad, doesn't spin the fan blade, overheats the compressor so it kicks out on thermal protection till it cools back down, and sometimes the motor will overheat and go into thermal protection also. Just make sure you are getting the 220v to the outside unit too, but shut all power off before doing any trouble-shooting. Hope this helps, feel free to ask any questions!

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I HAVE A CARRIER CENTRAL AIR, THE OUTSIDE FAN IS BLOWING INWARD AND WON'T SHUT OFF WHEN THE FURNACE SHUTS OFF AFTER TEMP IS REACHED


Check the t-stat to make sure that the "fan" switch is st to auto. If not the fan is in the "on" position and is always on. Otherwise, It sounds like your "Central Air" is a packaged unit(Furnace and air all one unit outside the home) and the fan relay inside the unit is stuck. This need to be replaced. It is the rectangular unit with the leads from the fan motor attached to it.

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It blows cold air for 5 min. and the it blows cool air for 15 min. the room warms up . Why does it stops blowing cold air continuasly???? The thermostat was disconectet on purpose so it coul clow cold air...


See if you can reposition the thermister on the facing of the evaporator coils. That could be it or the thermister might be bad. They don't use copper/mercury sensing bulbs these days. They use these cheap thermisters.

If you need further help, reach me via phone at https://www.6ya.com/expert/dan_73bbd84fe1d95b61

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If you have a amp meter you could measure the amount of current the fan is drawing and compare that reading with the amperage value printed on the fan motor.
More information is needed:
Is the compressor running?
How old is the unit?
What brand and size?
Are you getting a 240v where the fan connect to the power terminals?



Aug 27, 2009 | Ruud Central System Air Conditioner

1 Answer

Cooling fan in condenser sometimes does not run.


Shut off the power before inspecting or repairing! I would check the wiring harness inside the condensor unit for loose connections and or broken wire first. Then you might try removing the capacitor to the fan (some operate both the fan and compressor) and have it tested. If all is OK then your fan motor is probably overheating and may need replaced. A bad capacitor can cause the motor to overheat. If you had a lightning storm just before the problem the capacitor is most likely the problem.

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1 Answer

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This is a condenser fan and as long as the A/c unit is in cool mode, this fan will run. The only time it should shut off is when temperature setting is satified and the unit shuts off.

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2 Answers

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no cooling means outside unit is not operating due to
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Blower fan keeps shutting on/off,


Your blower fan turning on and off shows your thermostat is working. I am willing to bet you have the fan in the automatic condition. Check for a sticking contactor at the outside unit.

May 31, 2008 | Heating & Cooling

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