Quick answer

A fan fault will stop a miner outright to protect the chips. Fans are cheap and easy to swap, so this is usually a quick fix — but use the correct spec part.

Fan faults are the easiest ASIC repair: connector, then the fan itself.

Full diagnostic flow

Does the log name a specific fan (e.g. "fan_id 0 lost") or just a speed error?

Names a fan as lost/0 RPM → Reseat that fan's connector (and swap to a known-good fan port). Back to life?
Speed error / out-of-range RPM → Is the fan grinding/rattling or reporting wrong RPM?

Reseat that fan's connector (and swap to a known-good fan port). Back to life?

Fan spins / error clears → It was the connector or a dead fan. Replace the fan with the correct spec and you're done. [Fix it yourself] Error-code guide →
Still 0 RPM on a known-good fan → The control-board fan header/driver is faulty. That needs board-level repair. [Advanced DIY] Error-code guide →

Is the fan grinding/rattling or reporting wrong RPM?

Grinding/rattling bearing → Worn fan bearing. Replace the fan before it fails completely and overheats a board. [Fix it yourself] Error-code guide →
Wrong RPM but quiet → Wrong fan model or a tach-signal issue. Fit the exact spec fan the firmware expects. [Fix it yourself] Error-code guide →

This points at board-level damage. You can attempt it, but the realistic call for most owners is to send it to a repair bench.

Fix it yourself

Work the matching symptom decision tree and error-code guide step by step. Most cable, cooling, network and firmware faults are solvable on the bench you already own.

Send it to D-Central

Cracked solder, dead domains, shorted chips and EEPROM faults need a real repair bench. See transparent repair pricing or get a free repair quote — we diagnose and repair 38+ ASIC models in Laval, board-level, since 2016.

More tools: Kernel-Log Decoder · ASIC Fault Finder (650 codes) · All symptom trees

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Last reviewed June 12, 2026.