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Re: Compressor not working
It does sound like the compressor is locked up or one lead (wire) to the compressor is broken or burned in two or the run capacitor is bad. A service tech. could determine if the capacitor is ok and/or check the compressor by installing a hard start kit. If that works ok. If not then you need to replace the compressor. Either way I'd advise calling a certified Technician. This isn't someting you can do yourself.
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A few quick checks, the small line leaving the compressor should be to hot to touch ( hot gas discharge line). If you have gauges, typical compression range should be in the range of 3.5 to 4.5, also check to see if the compressor will pull a vacuum. Are the AMPs within 10 % of name tag ? hope this helps
check condensing unit outside, the fan could be turning but the compressor could be off
if this is the case turn the a/c off for about 10 minutes then turn it back on an hear if the compressor is trying to start. you should hear a loud humm if the compressor is trying to start but can not, if this is the case is likely that you have a bad capacitor. there are other causes for the compressor not starting this is the most common. always follow safety guidelines when working with high voltage.
My CKC was doing the same thing and I thought it was the compressor slamming to a stop. Turns out it was the fan motor. I had a local company replace the motor and the sound is gone. That being said, it has now been replaced by blade vibration.. It just never ends!
check the cap for the fan. Will the fan start if you spin it when you hear the humming. Check the lock rotor amperage for the compressor to see if it is hung up. The cap if it is shared could knock out both the fan and comp so check both.
Most compressor has a speed sensor to compare with the cranshaft sensor to prevent the compressor locked up.When you raised the RPM, after 15 sec, if the 2 sensors are not in synch then the computer thinks that the compressor is locked up so it disable the cluctch that was why your AC stops working. Check out your Compressor speed sensor. Good luck.
(1)Check compressor contactor or relay if it stock in the close position
(2)Check for welded contact points
(3)Check switch control for defect
(4) Check if compressor contactor still geting power when it is off