If the condenser water pump fails, what is the most likely immediate effect on the refrigeration cycle?

• A. Refrigerant will not condense properly
• B. Evaporator will freeze
• C. Compressor motor will surge
• D. Expansion valve will jam

Answer: (A)

The condenser’s job is to reject heat from the refrigerant and turn it from a high‑temperature vapor into a liquid so it can move on to the expansion device. If the condenser water pump fails, heat removal from the condenser stops. The refrigerant can no longer condense properly, so the cycle can’t complete the condensation stage. This raises the high-side pressure and prevents the system from delivering the proper liquid refrigerant to the expansion valve, quickly degrading cooling performance. Other problems like the evaporator freezing or the compressor surging aren’t the immediate result of a pump failure; they’re potential follow-ons once condensation stops and pressures rise.