MOTOR OVERLOAD/TEMP NOT NORMAL ON ZA6

Hi, I am having a motor overload/temp not normal fault display on an atlascopco air compressor ZA6 compressor in a remote part in west Africa. I have disconnected the motor cable to check the circuit and it was okay, it only trips on low oil which is normal. I also connect the cable to the mototr back, separate the motor from the compressor end and it also runs well but, trips on low oil, normal I used hand to turn around the compressor and it was fine. so am comfused on what to do next. Kindly help me on what to do to resolve this issue. Regards, Olusegun Ayorinde.