Question 132Refrigeration & AC - Assistant Engineer

The correct answer is A) blown fuse or tripped circuit breaker in the motor circuit. When a refrigeration compressor motor fails to start, the first thing that should be checked is the power supply to the motor. A blown fuse or a tripped circuit breaker in the motor circuit is the most common cause of a compressor motor not starting. This is because the motor requires a steady power supply to operate, and any interruption in that supply will prevent the motor from starting. The other options (B, C, and D) are less likely to be the immediate cause of a compressor motor failure to start, as they are more related to issues with the refrigeration system itself, such as problems with the suction pressure regulator, expansion valve, or high-pressure cutout.