Two days ago I was called to a York 3 Ton 3 phase RTU. Thermostat off when I arrive. Turn thermostat on for cooling call. Go up on roof and the compressor is not running. Turn off the breaker. Ohm out the compressor and check for short to ground. All good. Flip the breaker back on and the compressor makes a grinding noise for about 5 seconds and kicks off. Shut the breaker off again and put my meter on compressor wire. Flip the breaker back on and its pulling 65 amps, making grinding sound, kicks off after 5 seconds. All three legs are getting power. Diagnose as a stuck compressor.
Give the owner of the business a quote to replace the compressor. The next day the owner calls me and says to cancel the compressor replacement. The property manager sent his a/c company out to verify it was indeed a bad compressor. Low and behold they tell the owner that it was a bad breaker and all is well now.
My question is would it be possible for a compressor to become unstuck? If so, what could I have done with a three phase compressor to make it run again???