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A malfunctioning compressor typically indicates several issues, and lower than normal head pressure is a key symptomatic sign. The compressor is responsible for circulating refrigerant and maintaining the system's pressure levels; when it is not operating correctly, it struggles to effectively compress the refrigerant. This can lead to lower head pressure, which is reflective of insufficient compression and inadequate refrigerant circulation within the system.

The head pressure in a refrigeration system is crucial for its operation, as it helps ensure that proper heat exchange occurs within the condenser. When the head pressure is lower than normal, it could also suggest that the refrigerant is not reaching the necessary pressure to effectively condense and cool as intended. This malfunction can impair the entire cooling process and lead to a decrease in system efficiency.

The other choices relate to conditions that are not typically associated with a malfunctioning compressor. For instance, consistent suction pressure might indicate a different type of issue, while increased cooling output and enhanced air quality are generally signs of a properly functioning system, not one that is experiencing compressor failure.