Be sure to use gauges when trying to troubleshoot these units.
Calculated pressure values from the panel may make a fool out of you.
I know they did once with me
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I believe you have a problem with the female unloader, that is the solenoid on the left hand side looking the compressor from the discharge end, when the chiller runs with low load the compressor unloads fully and that causes the oil to get hot, but the control should energize the female unloader to prevent this from happening, so if you checked the obvious (dirty condenser, low refrigerant charge, out of calibration oil temp sensor, non-condensable) and still can't find the culprit check this.
Originally Posted by PACKLEADER
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