Unit turns on,compressor kicks on but fan does not turn,motor makes humming noise

The problem could be the capacitor for the fan motor or the fan motor itself. Turn off the power and use a long screwdriver to see if the fan will turn freely. If it doesn't it needs to be replaced. If it spins freely then check the capacitor. You can do that with a multimeter with the capacitor check function or take it to a heating and air supply and they can check it for you. If the capacitor looks swollen then it is bad. Some units use a three terminal capacitor that is connected to the fan and compressor. Make sure you check the fan side but it wouldn't hurt to check both while you're at it. If the capacitor is good then use an ohmmeter to make sure the fan motor windings a not open or shorted. The increasing noise probably comes from the head pressure building on the compressor because the fan isn't running.

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.

Hi!!
It could be many things, the most common are Low R22 refrigerant, bad fan motor, bad compressor. obstructed condenser coil, bad starting relay, bad capacitor. among other things.
To check fan motor, set unit to HI Fan Only setting and let it run for a while, check that fan did not loose speed and it is not getting too hot.
If fan is OK, then turn unit to HI Cool 60-65 degrees and see what happens. Hear if compressor kicked in or if just made a humming noise and stopped. if this happens, replace capacitor.
Keep me posted!! Rate this post!!

If the humming is your compressor running (feel the large copper line going into the unit, it should feel cold aftter a few minutes of run time) then the fan motor or the capacitor or both need to be replaced, check for voltage to the fan motor when the unit is "humming" if it has voltage and will not start replace the fan motor and the capacitor. hope this helps.

The compressor coming on does make a slight "humming" sound which is normal. Is the unit cooling properly? Do you think it is louder than before?

When you shut it off and back on it slugged the compressor if you turn it off and back on before the pressures equalize between the high and low sides it will slug the compressor and it will not run should let sit for five minutes or so before restarting. The humming is either the compressor making noise usually common for the compressor to make some noise or the fan motor bearings are getting bad on the outside unit. If the unit works normal probably not much you can do till it breaks if it is the compressor it is more economical to replace the whole unit if it is just the fan motor it is worth changing. You could take an amp draw on the fan motor and the compressor to see if the are within the limits on the name plate of the outside unit.

compressor is locked up! check the start relay and the fan motor to see if the shaft wobbles up and down if it don;t! then replace the compressor

Fan motor is dry or going bad try to lubricate it and see if that frees it up. If not you will need to get a new fan motor.

Sounds like you have either a bad fan motor or a bad fan motor capacitor. When you turn the unit on with the fan not working, the compressor (the humming noise) runs and gets real hot real quick resulting in the compressor cutting off ( the nothing after) on it's inside high temp switch. This is what the compressor is designed to do so that when this happens, it does not burn the compressor out. Replace you fan capacitor, give the compressor an hour to cool, then try it. In most cases and if I'm correct, the unit will run just like you want it to. Good luck.
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turn it off call repairman