Both low-side and high-side pressures are above normal during a performance test. What could cause this issue?

When both low-side and high-side pressures are above normal during a performance test, the primary issue is often related to the refrigerant charge within the system. An overcharged system can lead to elevated pressures on both sides. When too much refrigerant is present, it restricts proper flow and can result in increased pressure readings.

Additionally, insufficient airflow through the condenser can contribute to high-side pressure. The condenser's job is to dissipate heat from the refrigerant. If airflow is restricted, the heat exchange process is hindered, preventing the refrigerant from cooling properly and thus causing high pressures.

Therefore, the situation described could be attributed to both overcharging the system and inadequate airflow through the condenser, making it clear that both issues are potential causes of the abnormal pressure readings observed during the performance test. This comprehensive understanding is crucial for diagnosing and rectifying problems in HVAC systems effectively.