Galaxy S8 moisture problem can occur for any phones, even the phone is not in contact with water!
When you have the moisture problem in Galaxy S8 or S8+, you cannot charge the phone through USB cable.
This Galaxy S8 how-to guide explains the causes of Galaxy S8 moisture problem and shows you the solution for such a moisture problem in Galaxy S8 and S8+.
Moisture problem message appears on many other Samsung phones. So, this guide also applies to the moisture problem on Galaxy S9, S9+, Note 8 and Note 9, and many other Samsung phones.
What is Galaxy S8 moisture problem? Isn’t Galaxy S8 waterproofed?
If you Galaxy S8 or S8+ was in contact with water, the USB port (multipurpose USB Type C port) in the bottom (see Galaxy S8 and S8+ layout) may be wetted.
Samsung equipped Galaxy S8 and S8+ with a humidity/moisture sensor to detect moisture buildup in the charging port.
Once the sensor detects the moisture is higher than a preset level, it will believe you get the Galaxy S8 moisture problem.
When you try to connect this Galaxy S8 or S8+ with moisture problem to the charger, the phone will refuse to charge the battery, and you will get a warning as shown below:
Moisture has been detected. To charge your device, make sure your charger/USB port is dry.
Preventing Galaxy S8 or S8+ from charging when moisture is detected in the USB port is a preventative measure to prevent more corrosion.
It is also a security measure.
Please note, Galaxy S8 moisture problem has nothing to do with waterproofing feature in Galaxy S8 and S8+.
The USB port is not sealed in Galaxy S8 and S8+. It is safe even if the USB port is immersed in water (less than 1.5m).
But water, especially seawater or swimming pool water may cause considerable corrosion if you do not rinse and dry the port timely.
Does it mean my Galaxy S8 or S8+ is damaged by moisture when I see the check port message?
No, the message simply alerts you that moisture was detected in the charging (USB) port.
Because of the detected moisture, Samsung then prevents you from charging Galaxy S8 or S8+ through the USB port to protect the port.
Whether there are any water damages inside the phone, the sensor is not able to give any information.
Apparently, Galaxy S8 or S8+ will not warn you for any water damages inside the sealed part. You will know such damages (if any) only when Galaxy S8 or S8+ does not work properly.
Can I charge the phone when I get the moisture problem in Galaxy S8 and S8+?
Moisture was only detected in the USB port, not in the battery. You can safely charge the battery wirelessly.
My Galaxy S8 or S8+ never touched water, why did I get this Galaxy S8 moisture problem?
Moisture can be built up from the humid air in some regions with proper conditions.
So, a few owners of Galaxy S8 and S8+ may get the moisture problem even if the phone was not in touch with water.
If this is the case, you can use a hairdryer (choose cool air if possible) to dry the port.
How to avoid Galaxy S8 moisture problem?
If your Galaxy S8 or S8+ was in contact with seawater or water in the swimming pool, you should rinse the USB port with tap water or pure drinking water as early as possible.
After rinsing the charging port, if possible, you can use a hairdryer to dry it.
I checked the USB port. It is dry. Why do I still get the Galaxy S8 moisture problem?
First, the moisture sensor in some Galaxy S8 or S8+ may be oversensitive. Some corrosion or even dirt may be detected as moisture.
If this is the case, you can use clean wipes, or tissue, to clean the port. It is better to power off Galaxy S8 and S8+ to do the cleaning work.
The second possible cause of the Galaxy S8 moisture problem is the software/data caching. In this case, you can try to clear USB settings data (read on).
How to fix Galaxy S8 moisture problem by clearing USB settings data?
If you are sure the USB port is dry and clean, but you still get the check port message when you try yo charge Galaxy S8 or S8+, you can try to clear USB settings to fix the Galaxy S8 moisture problem.
To clear USB settings data to solve moisture problem in Galaxy S8 and S8+, you may follow these steps.
Step 1: Go to Galaxy S8 applications manager
You can access Galaxy S8 applications manager in Settings —Apps.
By default, USB settings, like other system apps, are hidden in the app list.
To show system apps, as shown below, in Galaxy S8 applications manager page, tap the menu key (3 vertical dots) to access the menu.
Step 2: Choose to show system apps
As shown above, in the applications manager menu, tap Show systems apps.
This would make all apps including system apps visible.
Step 3: Find USB settings app
The apps are listed alphabetically.
You can easily find USB settings as shown below.
Tap USB settings to open the App info page for this app.
Step 4: Clear cache and clear data for USB settings
As shown above, in the app info page, tap Storage.
You need to tap clear cache first as shown below.
Then tap clear data. You will get a warning message after tapping clear data as shown below.
Tap Delete to proceed.
Step 5 (optional): Reboot the phone.
Now, you can try to reboot Galaxy S8 or S8+.
Then, try to charge the phone through USB port again.
Some snake oils and workarounds for Galaxy S8 moisture problem?
There are some reported workarounds for Galaxy S8 moisture problem.
Some may work only for very special cases. Some may be a kind of snake oil. Some works like a placebo.
#1. Rice jar/bag to dry the USB port
This is NOT recommended.
In the old time, if there is some moisture in the phone, you can put the phone in a rice bag a few days to dry it up.
It did work sometimes.
But for Galaxy S8 or S8+, it is watertight. You cannot use this method to dry internal.
For the charging port, you can dry it with a hairdryer or tissue. Rice bag will not do the magic in this case.
#2. charging through a computer
For some Galaxy S8 or S8+ phones with moisture problem, you cannot charge it when you connect it to the charger with a USB cable.
But if you connect the phone to a PC, “sometimes” you can charge the battery (although very slowly).
You probably should NOT try this. If there is real moisture issue in the USB port, charging the battery through this port may cause irreparable damage to the port.
If you need to charge the phone, try to charge it with a wireless charging pad.
#3. charging through a micro USB cable
A few owners reported that using a micro USB cable with the USB Type C adapter (which can be found in the Galaxy S8 or S8+ box) can bypass the moisture warning.
I am not sure how it works.
#4. Use another USB C cable or even another charger
It is possible that a dirty or damaged USB cable may trigger false moisture warning.
But the charger probably should never cause the issue.
Anyway, it is worthwhile to try another or a new USB Type-C cable.
#5. Reboot the phone with USB cable connected to the charger
This may temporally clear the warning, and it may charge your Galaxy S8 or S8+.
But it is again not recommended.
You should check with the local Samsung service center if you still get the check port warning (pop up or notification) even after you dry the port and try all the recommendations.
Can you fix Galaxy S8 moisture problem? Do you know how to clear USB settings to solve moisture problem in Galaxy S8 and S8+?
If you have any questions with Galaxy S8 moisture problem, please let us know them in the comment box below.
The community will help you find the answer or solution.
You may also check our Galaxy S8 guides:
- Galaxy S8 new features guide covers all new and unique features of Galaxy S8 and S8+.
- Galaxy S8 how-to guides give you detailed step-by-step guides on using most features of Galaxy S8 and S8+.
- Galaxy S8 user manuals let you download official Samsung Galaxy S8 user manuals in your own language.
- Galaxy S8 camera guides covered everything related to Galaxy S8 camera is covered in Galaxy S8 camera guides section.
- Galaxy S8 accessories guides help you find the perfect accessories for Galaxy S8 and S8+.
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