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MicroBT Troubleshooting Guide

112 error codes and fixes for MicroBT ASIC miners.

112 results
410 Warning

Whatsminer Error 410-412 – Hashboard EEPROM Read Error

Whatsminer M20S, M21S, M30S, M30S+, M30S++, M31S, M31S+, M32, M50, M50S, M50S+,...

Moderate DIY
Code 275 - power over temperature warning (WM_275) Warning

Whatsminer Error 275 – Power Supply Over-Temperature Warning

Whatsminer all series. Air-cooled M30S, M30S+, M30S++, M31S, M31S+, M32, M50, M50S,...

Easy DIY
271 Warning

Whatsminer Error 271 – Power Input Undervoltage Protection

All Whatsminer series — M20S, M21S, M30S, M30S+, M30S++, M31S, M31S+, M32,...

Moderate DIY
Code 270 - power input over voltage protection (WM_270, V_in > ~285V) Critical

Whatsminer Error 270 – Power Input Overvoltage Protection

Whatsminer all series. Air-cooled M30S, M30S+, M30S++, M31S, M31S+, M32, M50, M50S,...

Moderate DIY
Code 268 - power output current imbalance (WM_268) Warning

Whatsminer Error 268 – PSU Current Imbalance

Whatsminer air-cooled M30S, M30S+, M30S++, M50, M50S running stock BTMiner firmware. The...

Moderate DIY
263 Warning

Whatsminer Error 263 / 264 – PSU Communication Error

Whatsminer M20S, M21S, M30S, M30S+, M30S++, M31S, M31S+, M32, M50, M50S, M50S+,...

Moderate DIY
Code 240 - Low Voltage Protection for Power Output (PSU output rail UVP) Warning

Whatsminer Error 240 – Low Voltage Protection Shutdown

All Whatsminer air-cooled and hydro chassis running stock BTMiner: M30S, M30S+, M30S++,...

Moderate DIY
WM_218 - input voltage below 230V threshold (high-performance mode) Warning

Whatsminer Error 218 – Voltage Below 230V in High Performance Mode

Whatsminer M5x/M6x family running BTMiner firmware with HP mode capability: M30S++, M50S+,...

Moderate DIY
WM_206 Warning

Whatsminer Error 206 – Low Input Voltage Detected

Whatsminer M30S, M30S+, M30S++, M31S, M32, M50, M50S, M60 (all BTMiner-based models...

Moderate DIY
205 Warning

Whatsminer Error 205 – PSU Output Current Error

Whatsminer M30S, M30S+, M30S++, M31S, M31S+, M32, M50, M50S, M50S+, M50S++, M5x...

Moderate DIY
Code 202 - power voltage / temperature protection (PSU input-side trip: AC out of range, internal overtemp, or primary-side cap ESR drift) Warning

Whatsminer Error 202 / 203 – PSU Voltage or Temperature Protection

Whatsminer air-cooled M30S, M30S+, M30S++, M31S, M31S+, M32, M50, M50S, M50S+, M50S++,...

Moderate DIY
140 Warning

Whatsminer Error 140 – Fan Speed Too High

Whatsminer M30S, M30S+, M30S++, M31S, M31S+, M32, M50, M50S, M50S+, M50S++, M53S+,...

Moderate DIY
WHATSMINER_PSU_FW Warning

Whatsminer PSU Firmware Upgrade Failed via Test Fixture

Whatsminer P21, P21D, P21E, P221B, P221C, P222B, P222C PSUs paired with H3...

Advanced DIY
P21E_RIPPLE Warning

Whatsminer P21E Unstable Output Voltage and Ripple

Whatsminer P21E PSU — paired with Whatsminer M30S, M30S+, M30S++ (M30S+ era);...

Advanced DIY
P221B_HEX Info

Whatsminer P221B Hex Fault Code Decoder (0x0040–0x2000)

Whatsminer P221B PSU — `12V/265A` main + `12V/15A` aux, `220–240 V AC`...

Moderate DIY
P21_CONTACT - Whatsminer P21 PSU no output / loose copper-bar M6 screws Info

Whatsminer P21 PSU No Output — Loose Copper Bar Screws

Whatsminer P21 PSU and shared-hardware-revision P21+ units, deployed on Whatsminer M30S, M30S+,...

Easy DIY
H616 Info

Whatsminer – Bootloader Corrupt SD Card Recovery

Whatsminer M20S, M21S, M30, M30S, M30S+, M30S++, M31S, M31S+, M32, M50, M50S,...

Moderate DIY
WATER_LEAK Critical

Whatsminer Hydro – Water Leak Alarm Trip

Whatsminer M33S+, M33S++, M53, M53S, M53S+, M53S++, M63, M63S, M63S+, M64 Hydro

Advanced DIY
TEMP_OVER Warning

Whatsminer Error 5070-5072 – Water Velocity Abnormal

Whatsminer M30S++ Hydro · M33S+ · M33S++ · M53 · M53S ·...

Moderate DIY
ERR_CODE Warning

Whatsminer Error 2310-2350 – Low Hash Rate Warning

M20S · M21S · M30S · M30S+ · M30S++ · M31S ·...

Moderate DIY
2020 Critical

Whatsminer Error 2020-2022 – Stratum Pool Connection Failed

Whatsminer M20S, M21S, M30S, M30S+, M30S++, M31S, M31S+, M32, M50, M50S, M50S+,...

Moderate DIY
ERR_CODE Warning

Whatsminer Error 2010 – All Pools Disabled

Whatsminer M20S, M21S, M30S, M30S+, M30S++, M31S, M31S+, M32, M33, M50, M50S,...

Moderate DIY
ERR_CODE Warning

Whatsminer Error 810 / 820 – Wrong Firmware Water vs Air

M33 · M53 · M53S · M56 · M56S · M63 ·...

Moderate DIY
ERR_CODE Warning

Whatsminer Error 800-802 – Firmware Checksum Error

Whatsminer M20S · M21S · M30S / M30S+ / M30S++ · M31S...

Moderate DIY
Error 600 / env_temp_high / ambient out of range Warning

Whatsminer Error 600 – Environment Temperature Too High

All Whatsminer models running BTMiner firmware with the Error 600 fault map:...

Easy DIY
550 / 551 / 552 Warning

Whatsminer Error 550-552 – Bad ASIC Chips Detected

Whatsminer M20S, M21S, M30S, M30S+, M30S++, M31S, M31S+, M32, M50, M50S, M50S+,...

Moderate DIY
540 Critical

Whatsminer Error 540-542 – Chip ID Read Failure

Whatsminer M20S, M30S, M30S+, M30S++, M31S, M32, M50, M50S, M50S+, M50S++, M53,...

Moderate DIY
530 Warning

Whatsminer Error 530-532 – Hashboard Not Found

Whatsminer M20S, M30S, M30S+, M30S++, M31S, M32, M50, M50S, M50S+, M50S++, M60,...

Moderate DIY
Error 350 / 351 / 352 Warning

Whatsminer Error 350-352 – Hashboard High Temperature Protection

Whatsminer M30S, M30S+, M30S++, M31S, M31S+, M32, M50, M50S, M50S+, M50S++, M60,...

Moderate DIY
Error 302 Critical

Whatsminer Error 302 – Hashboard SM2 Temperature Sensor Failure

Whatsminer M20S, M30S, M30S+, M30S++, M31S, M31S+, M32, M50, M50S, M50S+, M50S++,...

Moderate DIY

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Last reviewed April 24, 2026.