Compressor fault diagnostic apparatus and system

A compressor fault diagnostic apparatus, comprising:

• a current sensing unit to sense a current flowing through a motor within the compressor;
• a fault diagnostic unit to determine whether or not the motor performs a reverse rotation based on the current flowing through the motor;
• and
• a cut-off unit to remove power from the motor based on a determination of the fault diagnostic unit,
• wherein the current sensing unit senses a first current flowing through a first winding of the motor of the compressor and a second current flowing through a second winding of the motor, respectively, and
• wherein the fault diagnostic unit compares a value of the first current and a preset reference current value, and determines whether the motor has performed the reverse rotation according to a result of comparing the value of the first current and the reference current value.