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🔌 NerdQaxe++ PSU FAULT / “Guru Meditation #40000000” — What It Means & How to Fix It

‪@SoloBlockio‬ ‪@SterlingSpecter1‬ ‪@Solo.Satoshi‬ ‪@TheHobbyistMiner‬ ‪@JINGLEMINING‬ ‪@brandoncoin‬ Have any of you legends seen this before?

In this video I explain what the NerdQaxe++ “PSU FAULT Guru Meditation #40000000” error means and how to troubleshoot it.

This error message is commonly seen on NerdQaxe++ (Rev6.1 and others) and often indicates a thermal shutdown or power regulation issue, not just a bad PSU. Many users report this fault is triggered when the voltage regulator overheats or trips due to poor thermal contact, and in some firmware versions the error text is misleading.


Possible Causes:
• Overheating voltage regulators or ASIC chips
• Bad / insufficient thermal paste
• Loose heatsink or contacts
• Firmware bug showing PSU fault instead of “Overheated”
• Unstable or inadequate power supply
• Blown internal fuse or contact failure

Fixes You Can Try:
✔ Reapply high-quality thermal paste (e.g., Arctic MX-4)
✔ Lower clock speed to reduce heat
✔ Update or rollback firmware
✔ Test with a better PSU (stable 12 V supply)
✔ Check heatsink seating & connectors
✔ Replace PSU fuse if blown

🔍 Many users online have found the error is tied to thermal issues or firmware display behavior, not always a true PSU failure.




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🔍 Common Causes (Reported by Users)
⚡ 1. Thermal / Overtemperature Shutdown

Many users saw the #40000000 error when the voltage regulator (VREG) or ASIC got too hot and the miner auto-shutdown to protect itself. In some cases the error display overwrites the original “overheat” message.
Reddit

📌 Example: A user set a lower shutdown temp (40 °C) and immediately triggered “PSU FAULT #40000000” — suggesting it’s tied to thermal trip behavior.
Reddit

🔌 2. Poor Thermal Contact / Bad Thermal Paste

Several miners report poor or insufficient thermal paste under the heat sink causing the miner to overheat quickly — leading to PSU fault shutdowns. Reapplying good thermal paste often fixes it.
Reddit

⚙️ 3. Firmware Bug

Firmware versions (e.g., 1.0.35) are known to display #40000000 for overtemperature faults instead of the correct error text. Users say a firmware update (e.g., 1.0.36-test5) changes the message to the proper “Miner Overheated” instead of PSU FAULT. Updates or rolling back firmware may help.
Reddit

🔋 4. Power Supply or Voltage Issues

Less commonly, the issue actually is the PSU (inadequate wattage, bad regulation, blown fuse) — especially if external PSU tests show unstable voltage or frequent restarts. This can trigger “PSU FAULT” messages.
Reddit

🧰 5. Loose Connections / Hardware Contact Problems

Users also mention loose screen connectors, contacts, pins, or heatsink mount issues triggering errors similar to PSU faults.
Reddit

🛠️ Things People Tried (Fixes That Worked For Some)

✅ Reapply thermal paste — remove heat sink, clean old paste, and apply a high-quality paste.
Reddit

✅ Lower clock speeds to reduce heat generation.
Reddit

✅ Update or roll back firmware to a version with corrected error reporting.
Reddit

✅ Replace or test PSU with a known good supply and proper 12 V output.
Reddit

✅ Check for loose connectors or contacts, especially around heat sink and display.
Reddit

🧠 Why It Happens — In Plain Terms

This error is often not a true PSU hardware failure but rather a protective shutdown triggered when the miner thinks something is wrong with power delivery or heat, such as:

voltage regulator overheating

improper thermal contact

incorrect firmware error reporting

unstable 12 V rail from PSU

blown fuse or contact issue on board