Samsung Galaxy Z Flip 4

Samsung Z Flip 4 Moisture Detected Won’t Go Away – How to Fix

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The “moisture detected” warning is a feature that Samsung has integrated into their Samsung Galaxy Z Flip 4 smartphones to prevent any potential damage to the device due to moisture or water exposure. 

The Z Flip 4 is equipped with a sensor in the charging port that detects the presence of water or moisture. When this sensor is triggered, the device alerts you with a “moisture detected” warning and prevents you from charging the device until the moisture has been removed.

However, there can be instances where this warning might be a false alarm, which is a frustrating thing. If you ask how such a false alarm could occur, a minor software glitch, dust or debris in the charging port, or a dirty charging cable could cause such issues.

Considering the number of users reporting the issue, we have created this guide to provide you with six solutions to resolve this issue and get rid of the “moisture detected” error from your Samsung Galaxy Z Flip 4. 

Let’s get started!

Fix 01: Restart the Phone

One of the effective solutions to fix the “moisture detected” alert is to restart your Samsung Galaxy Z Flip 4. Restarting the phone will refresh the system and clear temporary data, which could fix the error.

Here’s how to restart your Galaxy Z Fip 4:

  1. Press and hold the power key and volume down key together until the device starts to turn off and display the Samsung logo.
Unfold the Phone and Press the Power Button

After your device is restarted, charge it to see if the problem is resolved.

Fix 02: Clean the USB Cable

Dirt or dust accumulated on your USB cable will interfere with the connection between your phone and the charger. Then causing the device to mistakenly detect there’s moisture present. 

Therefore, you need to ensure that your USB cable is clean.

Clean the USB Cable

To clean your USB cable, follow these steps:

  1. Disconnect the USB cable from your Samsung Galaxy Z Flip 4 and the power source.
  2. Use a soft, dry cloth to gently wipe the ends of the cable. Avoid using any wet cleaning solutions as this could cause actual moisture issues.
  3. Once you’ve thoroughly cleaned the cable, let it air dry for a few minutes.
  4. After ensuring the cable is completely dry, reconnect it to the device and try charging it again.

Fix 03: Clean the USB Port

Just like the USB cable, the USB port on your Samsung Galaxy Z Flip 4 could also be a source of the false moisture detected warning. 

Clean the USB Port

Therefore you need to clean the USB port, and here’s how to do it:

  1. Switch off your device: To avoid any potential damage, turn off your Galaxy Z Flip 4 before you start cleaning.
  2. Use a can of compressed air: This is the safest way to remove dust and debris from the port. Aim the nozzle at the port and give a few short bursts of air. This should dislodge any particles inside.
  3. Try a soft, dry toothbrush: If you don’t have compressed air, a new, soft-bristled toothbrush can also do the trick. Gently brush the inside of the port to remove any dust or debris.
  4. Use a dry cloth: After cleaning with air or a brush, wipe the area around the port with a dry cloth to remove any remaining particles.
  5. Wait for the port to dry: If there was any moisture in the port, you need to let it dry completely before turning the device back on.

After cleaning the USB port, try charging the device again.

Fix 04: Clear “USBSettings” App Cache

The “USBSettings” is a system service in your Samsung Galaxy Z Flip 4 that manages the operations related to USB connectivity. This includes charging, data transfer, and the detection of moisture in the USB port. 

Sometimes, the cache data of this system service will become corrupted or outdated, leading to false moisture-detected warnings.

Clearing the cache of the “USBSettings” app will resolve this issue as it removes temporary data and allows the system to refresh its operations. 

Here’s how you can do it:

  1. Go to your device’s “Settings”.
  2. Scroll down and tap on “Apps”.
  1. Tap on the filter button and toggle on “Show system apps”.
Show system apps
  1. Scroll down to find “USBSettings”. Tap on it.
  1. Tap on “Storage”.
USBSettings storage
  1. Finally, tap on “Clear Cache”.
USBSettings clear data

After clearing the cache, restart your device. This will allow the changes to take effect and the system to start afresh. 

Fix 05: Update Software

In some cases, the “moisture detected” warning will be a result of a software glitch. Samsung frequently releases updates for its devices to fix such issues and improve overall performance. 

Thus, updating your Samsung Galaxy Z Flip 4 to the latest software version will potentially fix the moisture detected warning.

Here’s how you can update your device:

  1. Open the “Settings” app on your Galaxy Z Flip 4.
  2. Scroll down and tap on “Software update”.
Software update12
  1. Tap on “Download and install”.
  2. The device will now check for available updates. If there’s an update available, tap on “Install now”.
  3. Your phone will restart and begin installing the update. Make sure the device has enough battery or is connected to a charger during this process.

Note: The update process may take some time, and the device may restart several times. Do not interrupt the process.

Fix 06: Take Your Device to a Repair Center

If all the above solutions fail to fix the moisture-detected issue, there is a possibility that it be due to a hardware defect or severe water damage.

Repair Center

In such cases, you need to take the device to a certified Samsung repair center. Samsung professionals have the necessary tools and expertise to diagnose and fix the issue. If your device is still under warranty, you might be eligible for a free repair service. 

Note: Warranty terms may vary, and water damage often isn’t covered. It’s best to check with the service center about the warranty terms and conditions.

Wrapping Up

We hope these solutions have been helpful in resolving your issue without going to the repair center.

If you have any further questions or need more clarification on any of the steps, feel free to ask. We will be there for you. 

Also, share this guide with other Samsung Galaxy Z Flip 4 users who might be facing the same problem. Your support helps us to continue providing you with these detailed troubleshooting guides.

Have a nice day!


James is the leader of our website and brings a wealth of knowledge in hardware troubleshooting. With his background as a certified electronic technician and experience working at a smartphone repair shop, James has an intimate understanding of the inner workings of high-end smartphones. He will guide users through various steps to identify hardware issues and provide practical solutions. While James won’t dive into intricate technical details, he aims to empower users to take action and resolve hardware problems.