How to fix Samsung S21 Overheating? (10 Proven Fixes!)

Fix Samsung Galaxy S21 Overheating

It is undeniable that Samsung has a strong lineup of smartphones. It’s why Samsung has risen to become the largest manufacturer of smartphones in the world.

Having said that, some of their more recent releases have had their share of issues.

One such issue, reported by countless Samsung Galaxy S21 users, is encountering their S21 overheating.

Samsung S21 Overheating? Here’s how to fix it!

Samsung S21 Overheating
Samsung S21 Overheating

To fix the Samsung S21 overheating issue, avoid use while charging, inspect your case, close all apps, and uninstall and reinstall problem apps.

Additionally, disable background data, enable adaptive power saving, and enable adaptive brightness.

If the issue persists, wipe the cache partition, download the latest software update and avoid camera use.

Let’s review each of these steps in detail from start to finish.

Importantly, these steps will work whether you have the standard Samsung S21, Plus, or Ultra.

In fact, the causes, and fixes for the vast majority of smartphone overheating issues, whether it’s an iPhone overheating, or an S21, are mostly the same.

I am operating under the assumption that your S21 is in the Samsung recommended temperature environment range of 32 to 95 degrees Fahrenheit.

I highly recommend you complete all ten of these steps. Overheating issues are typically due to a combination of causes, as opposed to any one single cause.

Also Read: Best ways to fix Samsung One UI Battery Drain issues

Step 1: Avoid Use While Charging

First, an important distinction. Both wireless charging and fast charging will typically heat up the battery a bit more than a standard charge. This is normal.

And while it hopefully goes without saying, make sure you are charging your device in an airy and open environment.

If you have your S21 charging in your bed or in a half-closed drawer, then yes, your battery is going to overheat. 

Surfaces, where heat dissipation is poor, will increase temperatures to levels that are completely avoidable. So be intentional about where you charge your device.

Beyond this, it is always a good idea to avoid using your S21 while it is in the process of charging.

Using applications causes your power consumption to increase, which in turn leads to increased temperatures. 

Pair this activity with the natural heat generated by charging, and you are simply compounding the effect.

Step 2: Inspect Your Case

Who hasn’t purchased a cheap smartphone case from a random gas station at least one time in their life? We’ve all been there.

The problem with cheap cases though is some are extremely poor quality and have terrible circulation. 

If your device cannot naturally release heat, and worse, if this heat becomes completely trapped, you have a real issue.

So, take the time to closely inspect your smartphone case. Is it heavy and clunky?

Are there very few slits and openings where air can easily flow in and out? Is it extremely difficult to remove?

If the answer is ‘yes’ to any of these questions, you may want to consider replacing your case.

I highly recommend you select a Samsung-manufactured product that was specifically designed to fit your Galaxy S21.

Step 3: Close All Active Apps

As previously mentioned, active applications naturally consume power. When you allow too many apps to remain open and running in the background, you are creating a recipe for overheating. 

I’m personally amazed by how many users allow 10, 20, or even 30 apps to remain open for months!

To close running apps on your S21, first, tap the three vertical lines icon on the bottom left corner of the screen. All previously opened and running apps will now appear. 

From here, you can swipe a specific app up and off the top of your screen to close it.

Alternatively, select the Close All button in the bottom middle of the screen to close every open app all at once. 

Step 4: Uninstall and Reinstall Problem Apps

While less common, in some cases a buggy or faulty app is to blame. More specifically, an app may be opening and crashing continually in the background without you even realizing it.

To check if this is the case, inspect your mobile data usage. To do so, while on the home screen, swipe down from the top of the screen and select the Settings icon.

Next, tap on Connections, followed by Data Usage and then Mobile Data Usage.

A breakdown of every app’s data usage on your S21 will appear in a list. Pay special attention to your top ten apps by data consumption. 

Do they make sense based on your day-to-day use? Or do any seem odd and stand out to you?

If an app’s data usage surprises you, it is very likely there is a bug or issue with that specific app.

Should this be the case, go ahead and uninstall and then reinstall the app in question?

Step 5: Disable Background Data

Another step you should take is updating your device settings to disable background data

Your S21 is often continuously running apps and standard smartphone data packages in the background, even when they are closed!

Over time, this can slow your device day, drain your battery, and lead to overheating.

Fortunately, Samsung offers a setting adjustment that allows you to permanently prevent so-called background app data usage.

From your home screen, swipe down from the top of the screen and tap on the Settings icon.

Then, scroll down and select Apps. From here, individually select the apps you use the most, whether its Facebook, Twitter, or otherwise. 

Once the app in question is selected, tap Mobile data and slide the Allow background data usage toggle button to OFF.

Step 6: Enable Adaptive Power Saving Mode

Another neat feature Samsung has deployed is the Adaptive power saving mode.

When activated, this feature will automatically turn off or dial back various power-consuming settings.

In doing so, your battery will last longer, and the overall temperature of the device will reduce on average.

For example, the display refresh rate will drop from 120 to 60 as soon as you stop touching the screen for more than a few seconds. 

To enable Adaptive Power Saving, head back to Settings and select Battery and device care.

Next, tap on the Options icon (three vertical dots) in the top right corner of the screen and tap on Automation.

Finally, use the toggle button next to Adaptive power saving to turn it ON.

Step 7: Enable Adaptive Brightness

A final setting adjustment you should consider enabling is Adaptive brightness.

Just as the name implies, Adaptive brightness will change your screen’s brightness based on the amount of light detected by the device.

This feature can help prevent eye strain while at the same time-saving battery power. 

Go ahead and enable Adaptive brightness by selecting Settings, followed by Display.

Then simply slide the toggle button next to Adaptive brightness to ON.

Step 8: Wipe Cache Partition

Wiping your device’s cache partition will help free up storage by erasing residual files that are unnecessarily taking up memory space.

When your S21’s memory is at capacity, all processes need to run in overdrive to function which can lead to overheating.

Start by placing your device into recovery mode. To do so, turn off the phone.

Next, press and hold the Volume Up key and the Side Power key simultaneously.

As soon as the Samsung Galaxy logo appears, release both buttons.

An “Installing system update” message will now appear, followed by the Android Recovery menu options.

Use the Volume down key to navigate to the Wipe cache partition and press the Side Power key to select it.

The cache partition wipe process will now execute. Once it is finished, press the Side Power key again to select Reboot system now.

That’s it! Once your Samsung Galaxy S21 boot sequence is complete you should observe a noticeably cooler device.

Step 9: Download Latest Samsung Software Update

A broader software bug is also a common cause.

For this reason, it is important to ensure you are operating on the latest Samsung software version that is available.

Countless users have experienced dramatic device temperature improvements following a software upgrade.

To perform a software update, select Settings and then scroll down to Software update (or System updates).

Next, tap Download and install (or Check for system updates). 

Once the download is complete, be sure to follow the on-screen instructions to finalize the software installation!

Step 10: Temporarily Avoid Camera Use

As a final measure, consider laying off your camera for a bit.

I know, I know. This is not a long-term solution, but the S21 camera uses a tremendous amount of power.

So, if you are in a pinch and notice your device reaching unsafe temperatures while your camera is in use, consider temporarily shutting it down until things stabilize.


If you discover your S21 overheating, don’t panic. This is a common issue with ten proven fixes.

Galaxy S21 Overheating – Top 10 Fixes

  • Avoid use while charging
  • Inspect your case
  • Close all active applications
  • Uninstall and reinstall problem apps
  • Disable background data
  • Enable adaptive power-saving mode
  • Enable adaptive brightness
  • Wipe cache partition
  • Download the latest Samsung software update
  • Temporarily avoid camera use

If you’ve tried all of these fixes, and yet you are still dealing with this issue, you can try contacting Samsung customer service.

You can also use your device’s serial number to review your Samsung product warranty status.

Were you able to cool down your phone and prevent future issues? If so, or if you fixed the issue some other way, let me know in the comments section below!


Abhishek Jariwala is the Founder, Owner, and also Chief Editor at TheAndroidLab and he looks after all the daily stuff that takes place here. If you have any queries related to this site, you can contact him via email at [email protected] or on his Twitter handle.

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