Question 169Refrigeration & AC - 1st Asst/Chief

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 electrical circuit supplying power to the motor. A blown fuse or tripped circuit breaker is the most common reason for a compressor motor not starting, as it indicates an issue with the electrical supply rather than a problem with the refrigeration system components. Checking the fuses and circuit breakers should be the initial troubleshooting step before moving on to other potential causes, such as issues with the expansion valve, suction pressure regulator, or high-pressure cutout. The other options (B, C, and D) are less likely to be the immediate cause of a compressor motor not starting and would typically be checked after the electrical circuit has been verified.