Hi, I have a problem that you had suggested to some one else below. But want to know what I need to check my capacitor as the fan spins freely and is in fine shape, but if I start it manually (stick a screwdriver in to start spinning it) it stops spinning in about 30 minutes. It wont even hum at that point, it seems like an overheat switch as well? Any help is appreciated? You can email me at firstname.lastname@example.org (I am not sure how to check this). Thanks Joe
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Re: GE A/C fan motor
A weak run capacitor will cause the motor to overheat and trip the thermal overload. You will either need a capacitor testet or a multimeter capable of testing a capacitor (read in microfarads (MFD or uF)). Sometimes if you are lucky you can get the local a/c shop to test it for you at the parts counter since they will be able to sell you a new one. MAKE SURE POWER IS OFF BEFORE YOU STICK YOUR FINGERS IN ANYTHING. The capacitors hold the peak voltage not the RMS voltage so there can be 370+ volts on an energized cap. Sorry, I am not set up to do this over email outside of FixYa but you should have received an email with a link to this response. Please take the time to rate my solution FixYa as I take alot of time to ensure the accuracy and detail of my solutions. If you have any further questions, you can post comments to this question and I will be automatically notified.
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the three post capacitor has c for line voltage in, the f or fan is for the outdoor motor,and com or comp goes to start winding compressor.youll have to follow wires from indoor motor to find capacitor. to find wires to outdoor motor to capacitor you have line voltage and capacitor wires .look for schematic it would help or send colors of wires from both motors and compressor common,start .run.
the new ge fan requires its own capacitor, the brown and the brown/white go direct to new fan capacitor. black to relay (leg one of power) purple to relay (leg two of power. the compressor will have a wire to the relay and the other to the herm terminal. you now will have nothing to the original capacitor fan terminal. The new motor will have the diagram showing this. you need the capacitor that goes with the new motor. the grainger guy should have sold that to you with the motor.
on the motor should be a diagram detailing the wires. brown white goes to either side of the capacitor and brown wire to other side of capacitor. hi speed goes to normally open contact on the indoor fan relay and the wire designated common on the motor goes to the other side of power from the relay contacts.
There will be two reason for the fan motor won't work. first of all replace the fan capcitor. In normal Ac fans there will be two windings. The starting winding and the running winding. Running winding will be driectly connected to the power trough relay switching circuit and the starting winding trough a capacitor. If the capacitor is faulty then the fan will not sart. There will be three wires from the fan, one will be common , second will goto power line and the third will go to one end of the capacitor.The other end of the capacitor will goto the power line. In some motors there will be four line. In such motors the fourth wire will be Ground (Earth) connection.
second reson will be the winding of the motor may burned. In such cases you have to replace the fan motor.
OK, locate the terminals on the capacitor marked "HERM"(Compressor lead), "FAN", and "COM".(common)
HERM and COM remian as they are.
The wire going to "FAN" (usually brown) will be placed on either terminal of the new capacitor. (This is the ((usually brown)) wire comming off of the fan motor.) An additional wire needs to be run from the other terminal of the new capacitor to the "COM" on the old capacior.
What you are doing is bypassing the fan side of the old capacitor but still using the compressor side of the old Cap.
The fan should have a wiring diagram on it to help identify the wires if there is no brown wire. The other two wires will be identified on the wiring diagram as well, but one typically goes to the contactor and the other to the board.
Pls check following......
1) If the Fan run and the Blower not function its min loose the hub or screw of the blower ,fix the hub or screw .
2) May be the the shafting of fan motor not rotate, repair the shafting or bushing of fan motor.
3) Check the Capacitor if this low capacitance or open (not function) using Multi-tester to check the parts.
4) Check the Fan motor wire if this loose connection.
if does not working,go to the nearest repairman to help the problem.