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Old 06-20-2012, 06:51 AM   #1
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Condensor fan motor


My a/c quit working at the end of last summer and i just now replaced the fan motor. the original problem : the unit would run for 20 - 30 minutes then the fan motor would shut down , but everything else would still be running. A co-workers brother said condensor fan motor , so i replaced it with a 4mb23 / same as the old one , also replaced the capacitor at the same time. Unit is still doing the same thing , reading about other trouble shooting on here i replaced the contactor but the unit will run for about 20 - 30 minutes then the fan stops again. when it does run it runs smooth blows very cold , nothing freezing up and all the coils are clean and free of any dirt and debree , any suggestions on what to do from here.

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Old 06-20-2012, 07:33 AM   #2
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Condensor fan motor


Are you sure the compressor still running?

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Old 06-20-2012, 07:54 AM   #3
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Condensor fan motor


yes unit in house is running and blowing , outside unit is running but the fan is not
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Old 06-20-2012, 10:17 AM   #4
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Condensor fan motor


does anybody have any suggestions that i can do myself, any help is greatly appreciated
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Old 06-20-2012, 10:32 AM   #5
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Condensor fan motor


Hope you don't mind me budding in for second, JJboy.

Turn the breaker to the condenser off. Straighten out a wire clothes hanger or find a long thin stick or something that wil fit into the lid of the condenser and try and spin the fan blades. If they are hard to spin at all, if it shows any type of resistance to spinning freely, the motor is bad.

Also, with power ON and the system calling for cool which would mean the compressor is running as you say it is but not the fan, touch the lid of the condenser where the fan is mounted. If it's abnormally hot (meaning you need to remove your hand quickly to avoid being burned ) then the fan is bad.
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Old 06-20-2012, 10:40 AM   #6
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Condensor fan motor


the fan motor will run , but only for about 30 minutes then gets hot the unit is still running but the fan is not, also this is a new fan motor , new cap and a new contactor
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Old 06-20-2012, 12:30 PM   #7
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Condensor fan motor


you need to have a multimeter with clamp for AMP connect to the fan. check if the Amp is ok all the time until the fan stop running.

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Old 06-20-2012, 01:00 PM   #8
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we just finished the amp test as reccomended , all amps and voltage are good , but once the fan stopped the amps started to climb , once again all advise is appreciated
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Old 06-20-2012, 01:27 PM   #9
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Condensor fan motor


I was just told that i could have a bad blade causeing the motor to overheat and shut down , does this make any sense to anyone
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Old 06-20-2012, 03:58 PM   #10
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Condensor fan motor


Sounds like the bearings are over heating in the motor causing it to bind after a half hour of running. Weak capacitor can do that as well as a faulty motor. Sometimes they're bad right out of the box. If the fan blade was bent you would see it wobble while running and there would be a lot of vibration.
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Old 06-20-2012, 04:04 PM   #11
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Condensor fan motor


Thanks , i have checked the blade again and i think it is fine . funny how you mention bad motor or cap out of the box , just exchanged both the motor and cap at grainger , installed and still the same problem , i am lost on this one
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Old 06-20-2012, 04:39 PM   #12
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Condensor fan motor


What is the model and serial number of the condenser.....I wanna see the electrical drawing.....
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Old 06-20-2012, 04:48 PM   #13
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Condensor fan motor


Are you sure its spinning in the right direction? Is this a heat pump?
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Old 06-20-2012, 08:19 PM   #14
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yes it is spinning in the correct direction and its a coleman condensor unit
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Old 06-20-2012, 09:05 PM   #15
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Quote:
Originally Posted by glambert25 View Post
yes it is spinning in the correct direction and its a coleman condensor unit

sn# ?????

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