I was checking a chilled water loop today and noticed that one of the Trane screw chillers had a “Winding Temp. fault on compressor B“. I was informed by one of the maintenance guys that they have had several of these faults over the past few months but were able to reset them. It won’t reset this time and the compressor is cool to the touch, except by the CCH. This building has had a bad history of voltage problems over the years, they are on the end of the power lines. During the hottest and coldest days of the year, it is common to have several "Severe Phase Unbalance" faults over a 24 hour period. The Electric Co. has made some corrections, but I don’t think the power is much better.
Does anybody have any ideas regarding the Winding Temp. fault, what should I look for?