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1325 Rue Bergar, Laval, QC support@d-central.tech 1-855-753-9997 Mon-Fri: 8:30 - 18:00

Quick answer

If your miner powers up, the fans spin, but it reports 0 hashrate, the chips are either not initialising or a hashboard has dropped offline. Work this tree from the easy checks down to the board-level ones.

Most "won't hash" cases are a loose signal cable, a failed power stage, or a dead chip breaking the chain.

Full diagnostic flow

Do the cooling fans spin up when you power on?
  • No, fans don't spin → Fans not spinning usually means no main power. Does the PSU fan spin and output 12-15V?
  • Yes, fans spin normally → Open the miner's status/kernel log. How many hashboards/chains report chips?
Fans not spinning usually means no main power. Does the PSU fan spin and output 12-15V?
  • No PSU output → PSU failure. Test the PSU on a known-good load; APW units commonly fail open. Replace or repair the PSU before touching the boards. [DIY with care] Error-code guide →
  • PSU outputs power but fans still dead → Control-board or fan-harness fault. Reseat the fan and signal harnesses; if the board still won't drive fans, the control board likely needs repair. [DIY with care] Error-code guide →
Open the miner's status/kernel log. How many hashboards/chains report chips?
Compare against your model: S19=76 chips/board, S19 Pro=114, S21=108, S21 XP=91.
  • All chains show 0 chips → All chains at 0 chips. Did you recently move boards between miners, or is this after a power event?
  • One chain is missing or low → A chain break. The fault is at the chip just after the last detected one — a dead ASIC, a cold solder joint, or a failed level shifter at a domain boundary. This is bench work. [Send it in] Error-code guide →
  • Chips detected but still 0 hashrate → Chips enumerate but hashrate stays at 0. Does the log show PLL/frequency or init errors?
All chains at 0 chips. Did you recently move boards between miners, or is this after a power event?
  • After moving/mixing boards → Likely EEPROM mismatch — boards from different miners carry different EEPROM data and won't hash together. Synchronise all boards to one EEPROM image. [DIY with care] Error-code guide →
  • After a power surge/storm → Surge damage to the boost/power stage or control board. Measure boost output (S19 ~19V, S21 ~25V) and power-input resistance. Expect board-level repair. [Send it in] Error-code guide →
  • No obvious trigger → Suspect the control board or a common power rail. Try a known-good control board of the same generation; otherwise send the unit in for diagnosis. [Advanced DIY] Error-code guide →
Chips enumerate but hashrate stays at 0. Does the log show PLL/frequency or init errors?
  • Yes, PLL/init/voltage errors → The chips can't reach their hashing frequency — a weak voltage domain or heat is stalling the PLL ramp. Check domain voltages and cooling. [Advanced DIY] Error-code guide →
  • No, looks clean but no shares → Check the pool config and network — the chips may be hashing but not submitting. Confirm the stratum URL, worker, and that the miner reaches the pool. [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.