How to Diagnose and Fix a Whatsminer That Won’t Hash at Full Speed

Your Whatsminer should be a workhorse. It should be churning through hashes and earning you Bitcoin every single second of the day. When you look at your mining dashboard and see a hashrate that is 20, 30, or even 50 percent below what you know the machine can do, it stings. You start doing the math on lost revenue, and it adds up fast. The good news is that a low hashrate almost always has a root cause you can fix yourself. You do not need to be an electrical engineer. You just need a methodical approach and a little patience.

Why Your Whatsminer Might Be Running Slow

Before you start opening panels, it helps to understand the main reasons a Whatsminer slows down. These machines are designed to run at maximum performance as long as their environment supports it. When something changes, the firmware automatically pulls back power to protect the hardware.

The most common culprits are:

• Thermal throttling: The miner gets too hot and the firmware reduces chip frequency to prevent damage.
• Power supply issues: The PSU cannot deliver stable voltage or enough amperage, causing the hashboards to run in a low-power safety mode.
• Hashboard failure: One or more ASIC chips on a board have degraded or failed, dragging down the total hashrate.
• Firmware glitches: An update or corrupted configuration file has locked the miner into a low-power profile.
• Network or pool problems: A bad connection to your mining pool can cause the miner to idle while it waits for work.

Each of these has a different fix. The trick is identifying which one you are dealing with without wasting time on the wrong solution.

Step 1: Check Your Temperatures First

Heat is the number one performance killer for ASIC miners. If your Whatsminer is in a garage, basement, or closet that gets warm, this is likely your problem. Even if the ambient air feels cool, the exhaust air from the miner might be recirculating back into the intake.

What to look for:

• Log into your miner’s web interface or use a monitoring tool like Awesome Miner or the pool’s dashboard.
• Check the chip temperature for each hashboard. Most Whatsminer models target a chip temperature between 55 and 70 degrees Celsius under load.
• If any chip is above 75 degrees Celsius, the firmware will start throttling down the frequency.
• Look at the ambient temperature sensor. The intake air should be below 35 degrees Celsius. Anything above that forces the fans to work harder and raises chip temps.

The fix:

If temperatures are high, start with airflow. Make sure there is at least six inches of clearance on the intake side and the exhaust side of the miner. In a rack setup, leave a gap between units. If you are stacking miners, alternate the direction of airflow so one unit is not breathing the hot exhaust of another.

Consider adding a dedicated exhaust fan to pull hot air away from the miner. For home miners, a simple box fan placed behind the exhaust can drop chip temperatures by 5 to 10 degrees. If you want a more permanent solution, check out our guide on cooling solutions that drop Whatsminer operating temperatures by 15+ degrees.

Symptom	Likely Cause	Fix
Chip temps above 75C	Poor airflow or high ambient temp	Improve ventilation, add exhaust fan
Hashrate drops during the day but recovers at night	Daytime heat buildup	Move miner to cooler location or add AC
One hashboard runs 10C hotter than the others	Fan failure or dust buildup on that board	Clean the board and check the fan
Hashrate slowly declines over weeks	Gradual dust accumulation on heatsinks	Compressed air cleaning every 30 days

Step 2: Verify Your Power Supply Is Healthy

A Whatsminer needs clean, stable power at its rated voltage. If the power supply unit is struggling, the miner will not hash at full speed. This is especially common with used miners or units that have been running for over a year straight.

How to test:

• Use a multimeter to check the voltage at the PSU output while the miner is running. You want to see 12.0 to 12.6 volts DC under load. If it drops below 11.5 volts, the PSU is failing.
• Listen for the PSU fan. If it is making grinding noises or has stopped spinning, the PSU is overheating internally and will throttle.
• Check the PSU temperature by touch. If it is too hot to keep your hand on for more than five seconds, it is overheating.

The fix:

A failing PSU needs to be replaced. Do not try to repair a switching power supply yourself. They store dangerous amounts of energy even when unplugged. Replace it with a genuine MicroBT power supply or a high-quality third-party unit rated for your model’s power draw. Our Whatsminer power supply failures guide has specific replacement recommendations for each model.

Expert advice: Always replace PSUs in pairs if your miner uses two. Mixing a healthy PSU with a weak one causes the healthy unit to work harder and fail sooner. Replace them together for balanced performance.

Step 3: Diagnose a Failing Hashboard

If temperatures and power are fine but the hashrate is still low, you likely have a hashboard issue. Whatsminer units have multiple hashboards, and each board has multiple ASIC chips. When one chip fails, the entire board can drop to a lower hashrate or stop working entirely.

Signs of a bad hashboard:

• The web interface shows one board with significantly lower hashrate than the others.
• The miner reports error codes related to chip failure or “chip offline” messages.
• You see physical damage like burned components or cracked solder joints on the board.

How to test:

1. Power down the miner and remove the top panel.
2. Carefully disconnect the hashboard cables. Label them so you know which board is which.
3. Boot the miner with only one hashboard connected. Note the hashrate.
4. Repeat this process for each board. Compare the hashrates. A board that produces 30 percent less than the others is failing.

The fix:

A failing hashboard needs to be replaced. You can buy replacement boards from MicroBT distributors or trusted resellers. The installation process is straightforward: remove the old board, insert the new one, and reconnect the cables. Just be careful with the ribbon cables. They are delicate.

For a detailed walkthrough, see our complete guide to diagnosing and fixing a Whatsminer that won’t hash at full speed. This article covers the full disassembly and reassembly process.

Step 4: Rule Out Firmware and Configuration Problems

Sometimes the hardware is fine, but the software is holding the miner back. Firmware updates can sometimes change performance profiles, or a configuration file can get corrupted.

What to check:

• Log into the miner’s admin panel and look at the performance mode setting. Make sure it is set to “High Performance” or “Turbo” and not “Eco” or “Silent.”
• Check the firmware version. Compare it to the latest version on MicroBT’s support site. If you are several versions behind, an update might fix known performance bugs.
• Look at the pool configuration. If your miner is set to a low difficulty pool or is constantly switching between pools, it will waste time and show a lower average hashrate.

The fix:

• Update the firmware if needed. Use a wired Ethernet connection for stability. Do not update over WiFi.
• Reset the miner to factory defaults and reconfigure it from scratch. This clears any corrupted settings.
• If you are using custom firmware from a third party, consider reverting to stock firmware to see if performance returns. Our guide on how to flash custom firmware on your Whatsminer without bricking it covers the safe reversion process.

Step 5: Check Your Network and Pool Connection

A miner that cannot communicate properly with the pool will show a low hashrate because it spends time waiting for work. This is often mistaken for a hardware problem.

Symptoms of a network issue:

• The miner shows “Idle” or “Waiting for Work” frequently in the logs.
• The hashrate graph shows flat spots where the miner is not hashing at all.
• You see “Stale Share” or “Job Not Found” errors in the pool dashboard.

The fix:

• Use a wired Ethernet connection instead of WiFi. WiFi is unreliable for mining.
• Check your router for packet loss. Run a continuous ping to your pool’s server. If you see any dropped packets, the connection is unstable.
• Consider using a dedicated mining pool with servers closer to your location. Pool distance adds latency, which can cause stale shares.

For a deeper look at this issue, read our article on why your Whatsminer keeps disconnecting from the pool and how to fix it permanently.

A Practical Troubleshooting Sequence

When you notice a low hashrate, work through this list in order. It will save you time and prevent you from chasing the wrong problem.

1. Check chip temperatures in the web interface. If any chip is above 75C, fix the cooling first.
2. Verify PSU voltage with a multimeter. Replace the PSU if voltage drops under load.
3. Run the single-board test to isolate a failing hashboard. Replace the bad board.
4. Update firmware and reset to factory defaults.
5. Test the network connection with a wired ping test. Switch pools if needed.

Common Mistakes That Make Things Worse

Mistake	Why It Hurts	Better Approach
Running the miner with the cover off to cool it	Disrupts designed airflow, actually increases chip temps	Improve external ventilation instead
Using a lower-rated PSU to save money	Causes voltage droop and throttling	Always match or exceed the original PSU rating
Ignoring dust buildup for months	Insulates heatsinks and raises temps by 5-10C	Clean every 30 days with compressed air
Updating firmware over a bad network connection	Can corrupt the firmware and brick the miner	Use a wired connection and verify the file checksum

Your Bottom Line

A Whatsminer that is not hashing at full speed is leaving money on the table. The fix is almost always simple: cool it down, give it clean power, replace a bad board, or update the software. You do not need to be a hardware expert to do this. You just need to be methodical.

Start with the temperatures. That is the most common issue and the easiest to fix. If your miner is in a hot garage or a cramped closet, moving it to a cooler space with better airflow could restore full performance in minutes. If temperatures are fine, move on to the power supply and then the hashboards.

Every hour your miner runs below its potential is lost profit. Take the time to run through these diagnostics. Your wallet will thank you.

And if you find yourself needing a replacement part or a new miner entirely, check out our top 5 MicroBT Whatsminer models for max profitability in 2026 to see which hardware will serve you best going forward.

Getting Back to Full Speed

The goal is simple. You want your Whatsminer to run at its rated hashrate 24 hours a day, 7 days a week. That is the baseline for profitability. By following the steps in this guide, you can identify and fix the issue yourself, often in under an hour. If you run into a problem you cannot solve, do not hesitate to reach out to a professional repair service. Sometimes a failed hashboard needs a specialist. But for most cases, you have everything you need right now to get your miner back to full speed.

Go ahead and run through the checklist. Your miner will be back to earning at its full potential before you know it.