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Re: a/c won't run, only a humming noise when turned on?
Was the a-conditioner serviced recently ?Anyways just slide out the "machine "part ,loosen the screws ,holding the top plate and re-insert. check whether it works now .If it works ,it was only a alignment problem .tighten all the screws evenly .
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sounds like it is either low on Freon or the compressor is going out. The blowing ice cold is an indicator that it may be freezing up because the low Freon. when it stops blowing cold, turn it to fan only mode and see if it gets colder again. If that is the case then the unit is low on freon and freezing up. I know that sounds confusing but that is how AC works. The low freon pressure means the gas is expanding too fast and the air flow cannot take up the cold from the evaporator fast enough. Turning the compressor off and keeping the fan on will alow the room air to take up the cold.
Its possible that the contactor that closes to start the outdoor unit is not pulling in and passing power. You are hearing the coil humming since it is getting control power. Also first check that breaker for outdoor unit is not tripped
Are you sure the humming noise is from the compressor motor being locked up? It is normal for the compressor motor to make a humming noise when it runs. Make sure the fan in the freezer is also running while the compressor motor is running and replace it if necessary.
You need to defrost the coils in the back of your freezer. You can do this the slow, easy way by simply unplugging the refrigerator for 24 hours. Leave the doors open to ensure everything has the chance to melt.
The fast way to defrost the coils is to turn off the refrigerator and remove the rear panel from the freezer compartment. You will see the evaporator coil completely frozen with ice. Thaw the ice with a hair dryer and make sure you thaw the drain at the bottom of the back wall as well.
When you turn replace the freezer panel and turn the refrigerator back on, it will get cold again.
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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Is the air conditioner completely dead? See section 1. Is the thermostat knob turned to the proper setting? Is the compressor motor running? The compressor is a football-sized case with no apparent moving parts. It is located inside the air conditioner at the center. Is it humming or making any kind of continuous noise or causing the lights to dim? If it is making a continuous noise, and your air conditioner is still not cooling at all, there may be a serious problem with one or more of these areas:
These items are not user serviceable. You will need to contact a qualified appliance repair technician to repair these components.
If the compressor is not running but you do have power to the air conditioner there may be a problem in one or more of these areas:
When the heat is not on. Go to the T-stat and turn the fan to the on position. With the blower now running is it making the noise? If so you probably either have something in there such as the filter that was mentioned, a piece of paper etc. or one or more of the blades on the blower wheel is vibrating. Don't let the condition persist w/o having it checked out or you may turn a simple fix into a costly one.