ERR_FAN_SPEED
Critical
Antminer S9 – Fan Speed Error
fan lost, fan speed error
Critical — Immediate action required
Affected Models:
Antminer S9, S9i, S9j, S9k
Symptoms
- Fan error displayed on dashboard
- Fan RPM reads 0
- Miner stops hashing
Step-by-Step Fix
1
Check which fan is failing (front or rear) in the web interface.
2
Power off and inspect the fan connector on the control board.
3
Reseat the fan connector firmly.
4
If connector is fine, the fan motor is likely failed. Replace with compatible 120mm 12V fan.
5
Power on and verify both fans show normal RPM readings.
Related Error Codes
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