521. If a refrigeration compressor had developed a slightly high suction pressure accompanied with an abnormally low suction temperature, the problem could be a result of which of the following?

Liquid refrigerant flooding back from the cooling coil explains the observed conditions: a slightly high suction pressure and abnormally low suction temperature. Floodback introduces a large mass flow of cold refrigerant, lowering the suction temperature while preventing a typical pressure drop.