Commercial Food Equipment Service Association (CFESA) Refrigeration Certification Practice Test

A malfunctioning compressor often presents symptoms such as unusual noises and overheating. This is indicative of internal issues, such as wear and tear on the mechanical components or lack of lubrication, which can lead to increased friction and resistance within the compressor. As the compressor struggles to perform its function, it may produce unexpected sounds like grinding, rattling, or hissing. Overheating occurs as the compressor works harder than normal, leading to potential failure if not addressed promptly. This symptom is crucial for technicians to recognize, as it signifies that the compressor may require servicing or replacement to restore proper functionality and prevent further damage to the refrigeration system.

The other options depict scenarios that would not arise in a faulty compressor. A stable temperature throughout the system, consistent refrigerant flow, and regular operation without interruption suggest that the compressor and the entire refrigeration system are functioning correctly, which contrasts with the signs of malfunction indicated by unusual noises and overheating.