Samsung Galaxy S21

Samsung S21 “Moisture Detected” Won’t Go Away – How to Fix

Are you keep getting "Moisture detected" alert on your Galaxy S21? This guide is here to help you!
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The “Moisture Detected” alert is a safety feature that is designed to prevent your Samsung Galaxy S21 from charging when it detects moisture in the charging port. The alert typically appears when you plug your device in to charge, and the device has detected the presence of water or moisture in the charging port.

While this is a useful feature to prevent damage to your device, it can sometimes give false alerts due to various reasons such as dust, software issues, or even hardware defects in the charging port.

In this guide, we’ll guide you through the best solutions to fix this issue while discussing the most common causes of this false moisture detected alert.

So, let’s get started!

Note: Solutions in this guide will work on any Samsung Galaxy S21 model (S21, S21 Plus, S21 Fe, and S21 Ultra models.)

Editor’s note: We created these instructions using a Samsung Galaxy S21 running Android 13. Depending on your device’s software version, some steps and menu positions may look slightly different.

Quick Fixes

  • Clear USBSettings Cache
  • Clean USB Port
  • Check the LDR
  • Do a Software Update

Fix 01: Clean the Charging Port

Clean the charging port

The first step to troubleshoot the “moisture detected” alert is to clean your Galaxy S21’s charging port. This is necessary because the presence of dust, or tiny particles can sometimes trick the device into thinking there’s moisture.

By cleaning the charging port, you can potentially resolve the issue if it’s caused by foreign substances.

Here’s a simple on how to clean the charging port:

  1. Turn off your device first.
  2. Use a soft brush (like a camera lens brush) to gently remove any visible dust.
  3. Once you’re done, leave your phone for a while to allow any residual moisture to evaporate naturally.

After you’ve cleaned the port and allowed the phone to dry, try charging your device again. Then observe if the “moisture detected” alert has gone away.

Fix 02: Check the Charging Cable

Zoomed in usb cable with a caption says 'check the usb cable'

The second thing you should do is check your charging cable.  This is because the “Moisture detected” alert could be a result of moisture present on the cable rather than inside the charging port of your device.

To do this, carefully examine the ends of the cable that connect to the power source and your device. Look for any signs of liquid or moisture. If you find any, use a cloth to gently wipe it off. Make sure the cable is completely dry before attempting to charge your device again.

After wiping the cable dry, if the “moisture detected” alert doesn’t pop up, then the issue was due to the moisture on your charging cable. 

Fix 03: Clear USBSettings Service Cache

USBSettings service manages and controls how the device detects USB inputs such as the charging cables, earphones, other adapters, etc.

If this cache is corrupted, it could result in the moisture detected error appearing. In this case, clearing the cache of this service will resolve the issue.

Follow the steps below to clear USBSettings cache:

  1. Go to Settings.
  2. Tap on Apps.
  3. Tap on the filter icon at the top and toggle on “Show system apps”.
Show system apps
  1. Tap on USBSettings.
Usbsettings system service
  1. Go to Storage.
  2. Tap on Clear cache.
Clear usbsettings service cache

Fix 04: Check the LDR (Liquid Damage Indicator)

Tsg01001407 tsg01001408 inspect the phone or tablet s internal battery
Image from samsung

The LDR, or Liquid Damage Indicator, is a small indicator located inside the SIM card slot of your Samsung Galaxy S21. This is different from the sensor in the charging port that detects moisture. The purpose of the LDR is to provide a visual sign of whether the device has been exposed to moisture or liquid.

In case of exposure to moisture, the LDR changes its color, usually from white to red or pink. This color change is a clear sign that your device has come into contact with water or other liquids. 

Tsg01001407 tsg01001408 verify the phone has no liquid damage an ldi exposed to liquid
LDR indicating pink means the device is exposed to moisture (image from Samsung)

That is why it’s crucial to check the LDR because if it has changed color, it means that the moisture detected alert is not a false one.

To check the LDR, you need to eject the SIM card tray from your device. Once you’ve removed the tray, look inside the slot for a small, usually white, indicator. If it’s red or pink, it means your device has been exposed to moisture.

If the LDR has changed its color, it’s best to take your device to a Samsung service center and get it checked by a professional.

Fix 05: Update Device Software

Updating your Galaxy S21 is the best solution to the “moisture detected” alert on your Samsung Galaxy S21. The reason behind this is that software updates often include bug fixes and that can resolve various issues, including false moisture detection alerts. 

Besides, keeping your device updated is always a best practice as it ensures you have the latest features and security patches on your device.

Here’s how to update your Samsung Galaxy S21:

  1. Head over to Settings.
  2. Tap on Battery and device care.
Battery and device care
  1. Tap on Software update.
Software update
  1. Then, tap on Download and install.
Download and install

After the update, check if the moisture detected alert has disappeared.

Fix 06: Take the Device to a Samsung Repair Center

Smartphone repairing

If none of the solutions we have mentioned above worked to resolve the “moisture detected” issue on your Samsung Galaxy S21, we recommend you to take the device to a repair center. This is because while the DIY methods can solve minor glitches, a persistent moisture alert could indicate a more serious problem that requires expert attention.

To find the nearest Samsung Repair Center, you can use the Service Center Locator feature on the Samsung website. Simply enter your location, and it will show you the nearest authorized repair centers. You can also call Samsung’s customer service for assistance in finding a repair center.

Wrapping Up

By now, you should have a clearer understanding of why the “moisture detected” alert appears, and how your device detects moisture. We’ve also walked you through 5 solutions to fix the problem.

We hope that this guide has helped you to resolve the false moisture detected error on your Samsung Galaxy S21. If you have any questions regarding this guide, don’t hesitate to ask in the comment section.

Have a nice day!

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The founder of and the tech nerd of the team. He is specialized in Android/iOS development and web development.

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