What might indicate that a unit is suffering from excessive discharge pressure?

A unit suffering from excessive discharge pressure often leads to higher than normal compressor crankcase pressure. When discharge pressure increases beyond normal levels, it means that the compressor is working harder to expel the refrigerant, which can result in increased pressure buildup within the crankcase. This elevated crankcase pressure can be an indication that the system is not functioning optimally and may lead to inefficiencies or potential mechanical issues if left unaddressed.

By recognizing this condition, technicians can diagnose potential issues more effectively. The other options relate to various operational problems but are not as directly linked to the specific condition of elevated discharge pressure as the increase in crankcase pressure. Low cooling efficiency and low suction pressure may suggest other forms of malfunctioning within the refrigeration cycle, while excessive noise could indicate a different type of mechanical issue unrelated to discharge pressure specifically.