Compressor failure occurs when the heart of the refrigeration system stops pumping refrigerant effectively or ceases operation entirely. The compressor converts electrical energy into mechanical work to compress gaseous refrigerant, and failure results in complete system shutdown and no cooling or heating capability. Compressor replacement costs typically range from $1,200 to $2,800 depending on system size and type.
Common Failure Causes
Acid burnout from moisture contamination, slugging from liquid refrigerant entering the cylinder, and lack of lubrication accelerate compressor wear. Overheating from restricted airflow, high head pressures exceeding 450 psi, and electrical issues including low voltage below 10 percent of nameplate rating contribute to premature failure. Poor maintenance and extended operation without filter changes increase internal wear.
Diagnosis and Recovery
Technicians check discharge pressure, amperage draw, and perform superheat calculations to diagnose compressor problems. A failed compressor requires complete system evacuation, flushing with approved solvents, filter-drier replacement, and compressor changeout with new oil charging.
Prevention Strategies
Maintaining proper refrigerant charge between 5 and 15 degrees superheat, ensuring adequate airflow across coils, and scheduling annual inspections extend compressor life to 10 to 15 years.