Fan running full speed. HELP?

I got this Mac Mini off my friend, it’s been running the fan at full speed. It slowed down once, but i have no idea what caused it. It has an SSD and RAM upgraded to 8GB.

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I tried using Macs fan control, it’s not working. But it reads the temperature and fan speed.

Help anyone?

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What does the onboard diagnostics tell you? Restart your system and hold the D key

Reference: Mac startup key combinations

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Is the machine running hot at all? Or is it just running full speed for no apparent reason when it’s cold.

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