I have a Trane screw unit, RBH 150, that is going into phase loss alarm before the compressor can even try to start. Any ideas out there ?
Tight is tight, Too tight is broke.
That's a RTH sccrew....
Providing you have checked all three phase voltages to be correct then your next step is to check all the PT's and CT's and any fuses that may be in the wiring for them .