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Fan motor the consensor fan motor will not turn off when ac unit shuts down. the ac works fine...on and off but the fan outside continues to run. bad switch?

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I have the same problem with mine, I would love to know what to do to fix it. I have turned the machine off at the power box.

Mine is a Kelvinator split system

Posted on Jul 13, 2008

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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

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Cooling begins then indoor blower stops...outside unit continues to run


I had the same problem,if you do not monitor that you will make matters worst and burn the Compressor.your problem is the blower unit it has three speed sometimes four.it needs to be changed..

May 20, 2012 | Heating & Cooling

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It is a Bryant Legacy AC unit. Model #123RNA060-B. It has been running fine, now it has suddenly shut down. The interior fan is working, but the fan at the compressor shuts down. It will work fine for...


I had a unit do the same thing to me, everytime I would leave, it would stop working again. I had a bad fan motor that would spin fine and work for a little while, but would shut down. It was the motor windings that would overheat and shut off, as soon as they cooled, it would start back up. One way to check is to feel the top of the unit where the base of the fan mounts and see how hot it is, best to check while it's not working how it should, but try not to run it very long or you could damage the compressor. Hope this helps!

Jun 27, 2011 | Bryant Heating & Cooling

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Outdoor fan will stop running and compressor overheats and shuts off. it wont come back on til u reset it at the thermostat. the outdoor unit has a new compressor and fan motor.


I realize the outdoor unit has a new compressor and fan motor - therefore - both those components should be ok - however - the fan motor 'should not' be going off - and the fact that it is going off is what is causing your compressor to overheat and shut off.
The reason the fan motor is going off is - it is bad (breaking down electrically) and is going off on the internal overload. If this is the case (a) the motor needs to be replaced or (b) it's possible that the fan capacitor needs replacing; but fan capacitors generally do not cause much problem, and when they do go bad they usually develop an obvious (to the eyes) bulge. If the capacitor has a bulge in it - I would surely change it out -and probably would (as a shot in the dark) anyway - since they are relatively cheap ($10-$15).
In your complaint you say that "the outdoor fan will stop running and compressor overheats and shuts off." If it happens 'exactly' that way then I'm betting your problem will be that the fan motor is defective as mentioned above, with an outside chance of the capacitor being defective, in which case if it isn't the capacitor - you will need a new fan motor. Note: outside fan motors are notorious for being fickle and it would not surprise me in the least to find a fairly new outside motor that is defective. I would check and see if you had any warranty on it.
All that being said - it is also possible that your outside unit has a 'high pressure cut-out switch,' although most units don't have them anymore, these days. However, if you have such a switch - it is possible (very likely) that it is shutting off the AC. Note: a high pressure cut-out switch will 'shut the entire outside unit off,' not just the fan motor. If that is what is happening then there's a good chance you have such a switch.
If it is happening that way, (the entire outside unit stops) then I would try 'washing the outside coil' really, really good and see if it will run ok afterwards.
Note: outside coils are sometimes difficult to get clean - sometimes requiring you to disassemble to some degree in order to make sure you get them clean.
Always, Always turn all power (including inside thermostat) OFF when washing the outside coil.

Jun 07, 2011 | Heating & Cooling

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Sometimes, when the inside blower shuts down, the outside compressor and fan motor continue to run for some time. Other times, when the inside fan motor is running, the outside fan and compressor motors...


The thermostat has a timer on the on- cycle (5 min delay for the outside unit and blower inside) if you are not gonna call a service guy then ( for $25) you can go to homedepot (whatever you got out there) and buy a honeywell vertical digital heat and ac t'stat.
this one doesnt require you to set it up for a particular application. this may solve your problem. but as for warm air out of the registers you need a service guy to check that

Mar 27, 2010 | Ruud UAKA060 Air Conditioner

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Blower in attic & AC unit outside continuously run


Sorry to hear about your miss-fortune, you are right it is an wiring problem. Can you turn off the blower with the thermostat (cool-off-heat) or what happens when you switch the fan to (auto or on) When you say the outside unit is "rigged" is it mechanically being jammed or electrically? If its mechanically that should be removed (what a crappy thing to do) other wise it will run continuously as you may already know. That is what it sounds like, you should just be able to shut the entire system down by turning off the switch to the furnace. If it is electrically being held closed, he changed some of the wiring around in the attic unit, you better hope he was lazy and jammed a stick in the contactor in the outside unit or else you may need to learn more about HVAC wiring, none the less I would double check the thermostat wires going to the attic furnace there should be nomenclature on the unit or at least somewhat marked. This was probably disturbed when the new blower was installed, by the way that was your initial problem. Good luck and becarful

Aug 17, 2009 | Ruud Matching Split Air Conditioner

1 Answer

The a/c unit cooling fan shuts down shortly after unit kicks on.


If a fan motor quits working during a cycle it usually means that the thermal protector is turning it off. If you had an amp meter on it, you would notice that it is exceeding the listing on the nameplate, Nine times out of ten this is irreversable, the motor needs to be changed. Sometimes if there are oil ports on the motor, you can add a few drops of zoom spout oil and that does the trick. But usually the motor is already damaged. Good luck.

Jul 11, 2009 | Carrier 38CKC036 Air Conditioner

1 Answer

Big fan in outside unit shuts off but condensor keeps running....gets very warm in the house . AC repar man came and checked motor which worked fine when he was here. Now it has stopped working...


check for proper voltage at contactor, check capacitor, motor might be going out on overload. Meaning it is getting hot and shutting off. when it cools down it starts again. windings in motor are probably going bad.

Jul 02, 2009 | Heating & Cooling

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Fan on outside unit will run for a while and then will shut down but inside will stay running already cleaned coils on comp can motor on outside be going bad


look at wires if only two on contactor and one on capacitor then motor going bad hard or rough to turn not sure on this model but some units have a fan cycle switch that would bring on fan

Jun 10, 2009 | Ruud Central System Air Conditioner

3 Answers

Amana 1 ton Residential AC / Outside unit comes on for a sec


open the service panel to check for control voltage of 24volts when tstat calling, The contactor should be pulled in, if contactor is down,and contacts appear to be clean, and the unit is still not running, it is a bad compressor. to test this unplug the black wire from the compressoror at contactor,w/ power off! Turn on power if fan works normally it's a bad compressor. However if you see a swollen split cap(5 wires to a soup can looking w/ the terminal C,F,and Comp), switch it first and start at square one.
You also need to consider the high pressure switch if its cycling on off on off.

Mar 12, 2009 | Heating & Cooling

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