During tests to discover why a refrigeration compressor is running continuously, it is determined that the refrigerated space temperature is slightly above normal without ever reaching the desired minimum temperature. Suction and discharge pressures are normal for the corresponding box temperature. In this situation, what should you suspect?

Correct Answer: Option C — leaking door gaskets

When a compressor runs continuously with normal pressures but box temperatures remain slightly elevated, external heat infiltration is the primary culprit. Leaking door gaskets allow warm ambient air to continually enter the refrigerated space, overwhelming cooling capacity without altering thermodynamic system pressures.