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FAQ

Why does the PSU fan sometimes stop spinning on my TS-h1288X, TS-h1688X, or TS-1655?

Last modified date: 2025-11-27

Applicable Products

TS-h1288X
TS-h1688X
TS-1655

Explanation

The PWR-PSU-550W-FS02 power supply unit (PSU) used in these models features a temperature-controlled fan design. When the PSU temperature is below a certain threshold, the fan will stop spinning to reduce noise and improve energy efficiency. This is expected behavior and does not indicate a hardware issue.

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