Air Conditioning Repair Certification (ETI) Practice Exam

The primary cause of compressor failure is inadequate lubrication or overheating. Compressors are mechanical devices that rely on oil to reduce friction between moving parts. Proper lubrication is essential for maintaining the compressor's efficiency and longevity. When there is inadequate lubrication, it leads to increased friction, which can generate excessive heat. Overheating occurs when the compressor works harder than necessary due to issues such as high ambient temperatures, blocked airflow, or insufficient refrigerant levels. This excessive heat combined with inadequate lubrication can result in serious damage to the internal components of the compressor, leading to complete failure.

While low refrigerant levels, electrical surges, and noise and vibration can contribute to compressor issues, they are often symptoms or secondary problems rather than primary causes of failure. Inadequate lubrication directly impacts the mechanical integrity of the compressor, making it the most critical factor in compressor health.