After diagnosing a defective compressor, the technician should:

After diagnosing a defective compressor, the technician should:

• A. Determine why the original compressor failed.
• B. Replace the refrigerant.
• C. Increase the system pressure.
• D. Check the thermostat.

Answer: (A)

When a compressor is found defective, the important step is to determine why it failed. Identifying the root cause ensures that the replacement compressor isn’t doomed to fail again and that any underlying system issues are corrected. This involves inspecting factors that can cause compressor trouble, such as lubrication or oil return problems, electrical supply or starting components, refrigerant charge and cleanliness, and potential system design or operating conditions that led to overheating or abnormal pressures. Once the cause is found and addressed, you can replace the compressor, recover and recharge refrigerant as needed, and verify proper operation. Replacing the refrigerant wouldn’t fix a mechanical failure in the compressor, increasing system pressure can cause damage and is unsafe, and checking the thermostat, while important for overall control, does not address the compressor’s failure mode.

When a compressor is found defective, the important step is to determine why it failed. Identifying the root cause ensures that the replacement compressor isn’t doomed to fail again and that any underlying system issues are corrected. This involves inspecting factors that can cause compressor trouble, such as lubrication or oil return problems, electrical supply or starting components, refrigerant charge and cleanliness, and potential system design or operating conditions that led to overheating or abnormal pressures. Once the cause is found and addressed, you can replace the compressor, recover and recharge refrigerant as needed, and verify proper operation.

Replacing the refrigerant wouldn’t fix a mechanical failure in the compressor, increasing system pressure can cause damage and is unsafe, and checking the thermostat, while important for overall control, does not address the compressor’s failure mode.