: Listen for the internal cooling fan. If it isn't spinning when the unit is under load, the thermal protection might trigger or the unit could fail.

Dust acts as an insulator and blocks the honeycomb vents, preventing the 135mm fan from cooling internal components effectively.

The HYS3C210CS has a decent set of protection features:

The HYs3c210cs power supply running hot is not automatically a defect—it is a physics problem. Your job is to manage the thermal environment. If you ignore the heat, you will experience premature failure, machine downtime, and potential fire risk. However, with proper derating and active cooling, this affordable power supply can provide reliable service for years.