Just the other day I noticed that the AC unit wasnt cooling. I shut it off and it continued to make a humming noise, although the fan did quit blowing. I removed the front air filter cover and saw that the cooling fins were completely frosted over. The only way to stop the humming sound was to unplug it. I let it sit a few days, unplugged. I plugged it back in and same thing...it hummed while the power was shut off. It did cool and blow properly until it once again frosted up the cooling fins.
Any ideas would be greatly appreciated.
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Re: hums and freezes up????
The fan motor must have been stopping. If the fan stops, for sure the fins will freeze because there is no air flowing.
common Fan motor problems defective bearing or bushing and starting condenser. If the bearing is defective, it will heat up and seize.
Have the fan motor checked.
The fact that the fins are freezing, means that there is enough freon and the compressor is working.
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window unit ac !! not a fridge . the hum you hear is the ac compressor trying to come on , but due to loss of gas charge it shuts right off again , this will require a professional ac repairman to fix this , 1st he needs to find leak then repair leak then add back lost gas charge , watch cost of all these services vs cost of entire new unit , it could get expensive
You need to trace down that noise. Sounds like a bad or stuck relay or solenoid. Once you find what it is making the noise, you will either replace it, if it is bad, or find out why it is being energized continuously. Does this vehicle have a power rear door closer?
not sure if it is a package system or a split but this is what you do.go outside where your outdoor machine is, after it has been shut off for awhile, and you should hear 2 distinct noises.1 is the outdoor fan, you should see it spinning.the other is a comppressor hum.some compressors have noise bags on them so listen closely thru the fan noise.if you hear no hum listen for a hum about every 2 to 5 minutes.if you hear this hum every so often, chances are you compressor is seized or stuck.the only thing to do there is get a tech and try a big boost to get it going.
There is a recall on the control board of many of these models, butyour problem is likely not related. It sounds like a plugged drain system or a possible bad drain pump. That's why you are hearing the pump running constantly. I have written a guide to help. It is here. Thanks!