What could indicate that the compressor is failing?

Increased noise levels from the unit can be a strong indicator that the compressor is failing. Compressors are generally expected to operate quietly, so if you notice unusual or heightened noises—like rattling, buzzing, or grinding—this could suggest internal issues such as worn bearings, loose components, or even mechanical failure. Such audible signs often indicate that the compressor is struggling to function properly, which may precede a complete breakdown.

Regular voltage readings can be indicative of proper electrical supply, and thus cannot solely indicate compressor issues. Low temperature differential typically points to issues with the system's ability to heat or cool effectively, but does not directly confirm compressor failure. Constant high pressures in the refrigerant circuit may suggest other issues, such as overcharging or blockage, rather than indicating a failing compressor specifically.