How to Setup Bitmain Antminer S21 IMM？

What Should You Do Before Setting Up your Antminer S21 IMM?

Bitmain Antminer S21 IMM: The Ultimate Immersion-Cooled Bitcoin Miner

The Bitmain Antminer S21 IMM is a next-generation ASIC miner designed for high-efficiency Bitcoin mining with integrated immersion cooling technology. Combining Bitmain’s industry-leading chip design with advanced thermal management, the S21 IMM delivers higher hash rates, lower energy consumption, and extended hardware lifespan compared to traditional air-cooled miners.

Whether you’re a solo miner or a large-scale mining farm operator, the Antminer S21 Immersion offers exceptional performance and stability, helping you maximize your Bitcoin mining profits.

Before powering up your Antminer S21 IMM, proper unboxing and preparation are crucial for optimal performance and longevity. Here’s what you need to know:

Bitmain Antminer S21 IMM: Unboxing & Preparation Checklist

Step	Action	Notes
1. Unboxing	Open the package carefully and inspect for shipping damage.	Contact the seller immediately if damage is found.
2. Inventory Check	Verify all included components:	– Antminer S21 IMM unit – Quick start guide – Immersion cooling tank (if included)
3. Safety Prep	– Wear anti-static gloves. – Ensure a dry, well-ventilated workspace.	Avoid water exposure (unless prepping for immersion cooling).
4. Cooling Setup	For Immersion: – Prepare dielectric coolant (e.g., 3M Novec).	Immersion cooling requires non-conductive fluid and a sealed tank.
5. Power & Network	– Confirm voltage compatibility (220V/110V). – Prepare a stable Ethernet connection.	Use a surge protector for power stability.
6. Tools Needed	– Screwdriver (if assembling cooling tank). – IP scanner tool (e.g., Angry IP Scanner).	Helps locate the miner’s IP address for configuration.

How to Set Up Your Antminer S21 IMM for Mining?

Overview

The S21 Imm. server is Bitmain’s first version in the immersion server series. Power supply APW11I is part of S21 Imm. server. All S21 Imm. servers are tested and configured prior to shipping to ensure easy set up.

⚠️ CRITICAL SAFETY NOTICE: Antminer S21 IMM Usage Warnings

❗ MUST-READ BEFORE OPERATION

1. Damage Inspection
   → Always check for shipping damage before use. Refer to the layout diagram for proper component placement.
2. Power Safety
   → GROUNDING REQUIRED: Connect ONLY to an earthed mains socket (220V).
   → Ensure the socket is easily accessible for emergency disconnection.
3. Power Input
   → Single power-input only. The miner will not operate without the power supply socket connected.
4. Hardware Integrity
   → DO NOT remove screws or untie factory-secured cables.
   → NEVER press the metal button on the cover (risk of system failure).
5. Immersion Cooling Requirements
   → OIL IMMERSION MANDATORY: S21 IMM must be fully submerged in dielectric oil during operation.
   → Use only approved immersion oil (e.g., 3M Novec or equivalent).
6. Thermal Protection
   → Wear heat-resistant gloves when handling – oil and components may reach high temperatures.
7. Operational Environment
   → Recommended oil specs:
   • Temperature range: 0–50°C
   • Non-conductive, chemically stable dielectric fluid.
     → Maintain clean, dust-free surroundings to prevent oil contamination.

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🛑 NON-COMPLIANCE RISKS

• Voided warranty
• Equipment failure
• Fire or electrical hazards

Note: Actual server performance may vary. Consult Bitmain’s official documentation for updates.

NOTE:
1)Power supply APW11I is part of S21 Imm. server.
2) One ANTWIRE-20SP power cord is needed and should be connected to PDU.
3)The device is powered through a PDU with above listed power cable. Don’t plug in or detach the connector.
4) A readily accessible disconnected device which an disconnect simultaneously L1, L2, L3 must be incorporated external to the product.

Setting up the Miner

Step	Action	Details
1	Go to the official website	Visit: BITMAIN firmware download link Select “Others” on the left, then “IP reporter” on the right.
2	Download the file	Download: IPReporter.zip
3	Extract the file	Unzip the downloaded file.
4	Run IPReporter.exe as Administrator	Right-click IPReporter.exe and select “Run as Administrator.”
5	Select an option	Choose one: – Shelf, Step, Position (for farm servers) – Default (for home servers)
6	Start the process	Click “Start.”
7	Press the IP Report button	On the control panel, press and hold the IP Report button until it beeps (~5 seconds). The IP address will appear on your computer screen.
8	Enter the IP in a browser	Type the displayed IP address into your web browser.
9	Log in	Username: root Password: root
10 (Optional)	Assign a Static IP	In the Protocol section, configure: – IP Address – Subnet Mask – Gateway – DNS Server
11	Enter network details	Fill in the required network settings.
12	Save settings	Click “Save.”
13	Learn more	For gateway & DNS help: BITMAIN Support Article

Configuring the Miner

Setting up the Pool

Click Settings >Set the options according to the following table>Click Save after the configuration

Option	Description
Mining address	Enter the address of your desired pool. The servers support three mining pools, with priority order: – Pool 1 (highest priority) – Pool 2 (used if Pool 1 is offline) – Pool 3 (used if Pools 1 & 2 are offline).
Name	Your worker ID on the selected pool.
Password (optional)	The password for your selected worker (if required by the pool).

Monitoring Your Miner

To check the operating status of your server (taking S21 IMM 239T as an example):

Click dashboard marked below to check the server status.

Monitor your server according to the descriptionsin the following table

Option	Description
Number of chips	Number of chips detected in the chain.
Frequency	ASIC frequency setting.
Real Hashrate	Real-time hashrate of each hash board (GH/s).
Inlet Temp	Temperature of the inlet (°C).
Outlet Temp	Temperature of the outlet (°C).
Chip state	Status indicators: ● Green Icon – Normal operation ● Red Icon – Abnormal condition

Administering Your Miner

1 Checking Firmware Version

Step	Action	Details
1	Enter server backstage	Locate the firmware version at the bottom of the page.
2	Check File System Version	Displays the firmware date (e.g., 20240413).

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2 Upgrading System

Step	Action	Details	Important Notes
1	Access Firmware Upgrade	In the miner’s web interface, navigate to System > Firmware Upgrade	Ensure stable network connection
2	Configure Settings Preservation	Option 1: Check “Keep Settings” (default) – retains all current configurations Option 2: Uncheck “Keep Settings” – resets to factory defaults	Default = Recommended for most users
3	Upload Firmware File	Click “Browse” or “Choose File” → Select the downloaded firmware (.bin) → Click Update	Verify file compatibility with S21 IMM
4	Complete Upgrade	Wait for progress bar to reach 100% (2-5 minutes) → System will auto-restart	DO NOT power off during update
5	Post-Upgrade Check	Miner will return to settings page → Verify hash rate and pool connections	Reconfigure if you chose factory reset

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3 Modifying Your Password

Step	Action	Details
1	Navigate to System > Password	Open the password settings tab.
2	Set new password	Enter the new password and click Save.

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4 Restoring Initial Settings

Step	Action	Details
1	Power on & wait	Let the server run for 5 minutes.
2	Hard reset	Press and hold the Reset button for 10 seconds.

Environmental Requirements

Description	Requirement
Operating Temperature	-20°C to 45°C
Operating Humidity	10% to 90% RH (non-condensing)
Storage Temperature	-20°C to 70°C
Storage Humidity	10% to 90% RH (non-condensing)
Maximum Altitude	<2000 meters

Pollution Level	Example Sources	Minimum Distance Requirement	Additional Notes
Heavy Pollution	Smelters, Coal Mines	>5 km	–
Moderate Pollution	Chemical Plants, Rubber Factories, Electroplating Industries	>3.7 km	–
Light Pollution	Food Processing Plants, Leather Tanneries	>2 km	If unavoidable, choose upwind location
Coastal Areas	Seaside, Saltwater Lakes	Avoid within 3.7 km	If unavoidable, ensure airtight structure with AC cooling

Electromagnetic Environmental Conditions
Please keep your site away from transformers, high-voltage cables, transmission lines,and high-current equipment. For example, there should be no high-power AC transformers (>10KA) within 20 meters, and no high-voltage power lines within 50 meters. Additionally, keep your site away from high-power radio transmitters; for example, there should be no high-power radio transmitters (>1500W) within 100 meters.

How to Troubleshoot Common Issues with the Antminer S21 IMM?

Bitmain Miner Troubleshooting Guide: Fix Common Issues Quickly

Is your Bitmain miner experiencing problems? Follow this step-by-step troubleshooting guide to resolve network, power, and startup issues efficiently.

Antminer S21 IMM Troubleshooting Guide

1. Low Hash Rate (Poor Mining Performance)

Possible Causes & Solutions:

Issue	Check	Solution
Network Problems	– Ping your miner via local network – Check pool connection logs	– Restart router/miner – Use wired Ethernet or change to another one – Verify pool server address/port
Incorrect Pool Configuration	– Check worker name/password – Review pool difficulty settings	– Re-enter pool credentials – Try a different mining pool (e.g., Antpool → F2Pool)
Cooling Efficiency	– Monitor coolant temperature (ideal: <60°C) – Check for oil degradation (immersion)	Replace dielectric fluid if contaminated
Overclocking Issues	– Review frequency/voltage settings	– Reset to factory defaults – Gradually retune OC settings
Hardware Fault	– Listen for abnormal noises – Check for error LEDs	– Contact Bitmain support if hardware fails

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2. Overheating Alarms (High-Temperature Warnings)

Symptom	Diagnosis	Immediate Fixes	Preventive Measures
Oil temp >70°C	– Insufficient coolant – Poor circulation – Pump failure	1. Top up dielectric fluid 2. Check pump operation 3. Clean oil filters	– Monthly coolant quality checks – Install temperature alarms
Persistent high temp	– Ambient temp >30°C – Overclocked settings – Blocked heat exchangers	1. Improve facility ventilation 2. Reduce overclocking 3. Clean cooling system	– Maintain 25-28°C environment
Localized hot spots	– Uneven fluid flow – Component failure – Bubble accumulation	1. Adjust immersion tank tilt 2. Verify all components submerged 3. Bleed air pockets	– Regular fluid circulation tests – Use anti-foam additives

Preventive Measures:

• ✅ Monthly Maintenance: Clean/replace filters (immersion)
• ✅ Environment Control: Keep mining area below 30°C ambient
• ✅ Firmware Update: Ensure latest thermal management patches

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Pro Tips for Stable Operation

• 🔄 Benchmark After Changes: Monitor 24hrs after fixes
• 📊 Log Keeping: Record temps/hashrate to identify patterns
• ⚠️ Warranty Note: Avoid voiding seals if under warranty

Need More Help? Contact Miner Source for help!

What Information Should You Prepare for Customer Support?

When contacting support, having the right information can speed up the process.
Prepare your miner’s model, serial number, a description of the issue, and any relevant logs or error messages.

Bitmain Antminer S21 IMM Support Request Template

(For Faster Troubleshooting)

1. Device Identification (Required)

🔹 Model: Confirm as “Antminer S21 IMM” (Immersion Cooling Version)
🔹 Serial No.: Located on rear label

2. Fault Description

✅ Examples:

• “S21 IMM not powering on despite proper immersion”
• “Hashrate drops >30% after 6 hours in dielectric fluid”
• “Red status LED with E3 error code during pool connection”
  Pro Tip: Include duration/frequency (e.g., “Issue persists after 3 reboots”).

3. Critical Diagnostics

Data Type	How to Capture	S21 IMM-Specific Notes
System Logs	System > Logs (Save as .txt)	Filter for “oil_temp” or “pump_rpm”
Dashboard	Full-page screenshot	Must show immersion temp + hashboard
Pool Config	Miner Configuration > Pool screenshot	Verify stratum port matches pool docs

4. Immersion-Specific Checks

⚠️ For Liquid Cooling Models:

• Oil Quality: Photo of coolant clarity (cloudy? bubbles?)
• Tank Level: Marked between MIN/MAX indicators?
• Pump Status: Listen for circulation sounds (video helpful)

What Is the Repair Process for the Antminer S21 IMM?

Step-by-Step Repair Process

Antminer S21 IMM Repair Guide: Fast & Reliable After-Sales Service

If your Antminer S21 IMM is underperforming or malfunctioning, BITMAIN’s after-sales support ensures a quick and hassle-free repair process. Follow these steps to get your miner back to peak efficiency:

1️⃣ Contact Customer Support

📞 Reach out via BITMAIN’s official website or customer service hotline

2️⃣ Fault Diagnosis

🛠️ Provide device details (serial number, error logs) to help support identify the issue (hardware/software failure).

3️⃣ Ship Your Miner for Repair

📦 If a repair is needed, BITMAIN will guide you on safe packaging & shipping to their service center.

4️⃣ Professional Repair & Testing

⚙️ BITMAIN’s technicians will fix, upgrade (if needed), and rigorously test your device for stability.

5️⃣ Fast Return Delivery

🚀 Your fully functional Antminer S21 IMM will be shipped back via express delivery—minimizing downtime!

💡 Pro Tip: Always keep your purchase receipt and warranty details for smoother service

Conclusion

The Bitmain Antminer S21 IMM stands out as a high-performance mining solution, offering superior energy efficiency and extended hardware longevity thanks to its advanced immersion cooling technology. By maintaining lower operating temperatures, the S21 IMM reduces thermal degradation, ensuring stable performance over time while significantly cutting cooling costs compared to traditional air-cooled systems. Its near-silent operation also makes it suitable for noise-sensitive environments.

However, the S21 IMM requires a higher initial investment, making it best suited for large-scale mining operations that prioritize long-term efficiency and durability. Proper maintenance, including dielectric fluid checks and system monitoring, is essential for optimal performance.

We welcome feedback from users—share your experiences or questions about the S21 IMM to help others in the mining community make informed decisions!

If you need more information about Antminer S21 IMM, Please click to get more help.