This post list some common generic problems with Bitmain Antminer L7 fans and solutions.
1. The mathematical interface indicates that either the fan is malfunctioning or its speed is zero.
Causes and Treatment
The Bitmain Antminer L7 has four fans, and the control board and user panel of the mining device have the same fan numbers (FAN1, FAN2, FAN3, and FAN4, respectively). First check which FAN is abnormal, and replace the corresponding fan; if the problem still exists after replacing the fan, it means the control board is damaged, please return to the factory for repair.
2. Too high speed
Causes and Treatment
The corresponding fan needs to be replaced because the damaged fan requires replacement.
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