Repair workspace

Hotend Heatsink Fan Not Spinning

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Stop long prints until the heatsink fan is restored; clean the fan, check its connector and voltage, confirm firmware control, and replace a noisy or stalled unit.

Cooling & FansIntermediate13 min

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Ordered repair sequence

Step 1

Allow the hotend to cool and disconnect power.

Step 2

Remove visible debris without damaging the blades.

Step 3

Spin the fan gently and check for roughness or contact.

Step 4

Inspect the connector and cable through toolhead movement.

Step 5

Confirm the fan voltage, size, airflow direction, and connector match the printer.

Step 6

Use printer diagnostics to test the fan output if supported.

Step 7

Replace a fan that stalls, grinds, or starts intermittently.

Step 8

Verify stable hotend temperature and a long retraction test after repair.

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