The air temperature associated with a direct reciprocating air conditioning plant is found to be too warm, and the compressor is not operating. A service check determines the compressor suction pressure to be above the normal cut-in point, with a normal head pressure, and high evaporator superheat. Which of the following could be the cause of this problem?

Correct Answer: Option B — The low pressure control contacts are stuck open.

If the low-pressure control contacts are stuck open, the compressor will not receive the signal to start, even when suction pressure is above the cut-in point. This prevents the system from cooling, resulting in high evaporator superheat and warm air temperatures throughout the conditioned space.