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Which risk significantly increases when a heat pump operates with excessive superheat?

A)Compressor valve plate damage
B)Expansion valve capillary tube blockage
C)Evaporator coil icing and frost
D)Refrigerant overcharge indications

💡 Explanation

When superheat rises excessively, the compressor suction gas temperature and pressure increase because more heat is absorbed, raising the compression ratio and discharge temperature, leading to potential cracking. Therefore valve plate damage results, rather than blockage, icing or overcharge indications which arise from refrigerant-flow imbalances.

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