Which of the following indicates that a high pressure system has a leak?

A high-pressure system indicating a leak can be assessed through the presence of both high superheat and oil traces. When there is a refrigerant leak in a high-pressure system, it can lead to an imbalance in pressure and temperature, ultimately resulting in elevated superheat readings. This occurs because the quantity of refrigerant available for absorption of heat declines, leading the remaining refrigerant to become superheated before it reaches the compressor.

Additionally, the presence of oil traces around the system can be a crucial indicator of a leak. Refrigerants are often lubricated with oil, and when a leak occurs, this oil can escape alongside the refrigerant. The discovery of oil stains or residues can lead technicians to suspect that refrigerant has exited the system, indicating a leak.

Considering both these factors together confirms the likelihood of a leak in the high-pressure system, hence making the choice that includes both indicators the correct answer. Understanding and recognizing these signs is vital for effective troubleshooting and maintenance of HVAC systems.