My iPhone 8 Is Hot! Here's Why & How To Fix The Problem.

David Lynch

SEPTEMBER 13, 2017

Your iPhone 8 is overheating and you're starting to get worried. There's a chance you left it out in the sun for too long, but there could also be a software issue causing your iPhone to get hot. In this article, I'll explain why your iPhone 8 is hot so you can fix the problem and start using it again!

Why Is My iPhone 8 So Hot?

Your iPhone 8 is hot because the CPU is running at nearly 100%! When lots of programs are running on your iPhone simultaneously, the strain can cause it to overheat.

There's also a chance your iPhone 8 is hot because you left it out in the sun or in your car on a warm day for too long. iPhones are designed to function between 32 - 95 degrees Fahrenheit and your iPhone 8 may turn off if it falls out of that range.

If your iPhone 8 is too hot, you may receive a temperature warning that says you need to cool down your iPhone before using it again. Put it in the shade or in an air-conditioning room and it should cool off in a short while.

How To Fix A Hot iPhone 8

7 Steps Total
1.

Restart Your iPhone

Restarting your iPhone can sometimes fix minor software glitches and errors.

How Do I Restart My iPhone?

  1. Press and hold the power button (iPhones without Face ID) or the side button and either volume button (iPhones with Face ID) on your iPhone until the slide to power off slider appears on the display.
  2. Swipe the red power icon from left to right to turn off your iPhone.
  3. Wait about 30 seconds, then press and hold the power button (iPhones without Face ID) or the side button (iPhones with Face ID) again until the Apple logo appears in the center of the display.

Turn Off Your iPhone In The Settings App (Option 1)

  1. Open the Settings app on your iPhone.
  2. Tap General.
  3. Scroll to the bottom and tap Shut Down.
  4. Swipe the red power icon from left to right.
  5. Plug your iPhone into a power source using a Lightning cable to turn it on again.

Turn Off Your iPhone Using AssistiveTouch

  1. Watch our YouTube video or follow the steps below!
  2. Open the Settings app.
  3. Tap General.
  4. Tap Accessibility.
  5. Tap AssistiveTouch.
  6. Turn on the switch next to AssistiveTouch.
  7. Tap the AssistiveTouch button when it appears on the display.
  8. Tap Device.
  9. Tap More.
  10. Tap Restart.
  11. Tap Restart again when the confirmation alert appears.
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2.

Close Out Of All Of Your Apps

Closing out of your apps is like turning your iPhone off and back on — it gives your apps a fresh start. If one of the apps that you have open crashes in the background, it may prevent other apps you have open from functioning properly. It can be difficult to identify which specific app or apps are malfunctioning, so we'll close them all to save time.

How Do I Close Out Of All Of My Apps?

  1. Double-press the Home button to view the apps your currently have open.
  2. Use your finger to swipe up on the apps to close them.
  3. You'll know all your apps are closed when you only see a preview of your lock screen.
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3.

Update iOS On Your iPhone

If your iPhone is running an outdated version of iOS, you may run into problems that could be fixed simply by updating to the most recent version of iOS.

How Do I Update iOS On My iPhone?

There are two ways to update iOS on your iPhone: in the Settings app and by using iTunes.

Update iOS In The Settings App

  1. Open up the Settings app.
  2. Tap General.
  3. Tap Software Update.
  4. If an update is available, tap Install Now or Download and Install.

Update iOS Using iTunes (PCs and Macs running macOS 10.14 or older)

  1. Connect your iPhone to a computer using a Lightning cable.
  2. Open iTunes.
  3. Click the Phone button in the upper left-hand corner of iTunes (see image 3).
  4. Click Check For Update.
  5. If an update is available, click Download and Install.

Update iOS Using Finder (Macs running macOS 10.15 or newer)

  1. Connect your iPhone to your Mac using a charging cable.
  2. Open Finder.
  3. Click on your iPhone under Locations.
  4. Click the General tab.
  5. Click Check for Update.
  6. Click Download and Install if an iOS update is available.
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4.

Reset All Settings

Many iPhone problems are caused when Settings isn't set up correctly or by corruption within individual Settings app files. Restoring the Settings app back to factory defaults doesn't fix every iPhone software problem, but it is a go-to fix for Apple technicians because it does solve a lot of problems that would be very difficult to to track down by hand.

How Do I Reset All Settings?

  1. Open the Settings app.
  2. Tap General.
  3. Scroll down and tap Transfer Or Reset iPhone.
  4. Tap Reset.
  5. Tap Reset All Settings.
  6. Enter your passcode, if prompted.
  7. Tap Reset All Settings again to confirm your decision.
  8. Your iPhone will shut down, complete the reset, and turn itself on again will automatically turn back on when the reset finishes.
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5.

Back Up Your iPhone

It's important to back up your iPhone before doing any major restores (such as a DFU restore). If something goes wrong while you're trying to fix your iPhone, having a back up means you won't lose any of your data (such as contacts, photos, apps, and more). Restoring from a back up is a lot more convenient than having to go and reenter all the information that was saved on your iPhone.

How Do I Back Up My iPhone?

There are a few different ways to back up your iPhone:

Backup Your iPhone Using iCloud

  1. If you have a WiFi connection, you can back up your iPhone using iCloud.
  2. Open the Settings app.
  3. Tap on Your Name at the top of the screen.
  4. Tap iCloud.
  5. Scroll down and tap on iCloud Backup.
  6. Make sure the switch next to iCloud Backup is on. You'll know the switch is on when the switch is green.
  7. Tap Back Up Now.
  8. A status bar will appear to tell you how much time is remaining.

Backup Your iPhone Using iTunes

  1. Plug the Lightning connector on your Lightning cable (charging cable) into the Lightning port on your iPhone.
  2. Plug the other end of your Lightning cable into a USB port on your computer.
  3. Open iTunes on your computer.
  4. Click on the iPhone icon in the upper left hand corner of iTunes.
  5. Click the circle next to "iCloud" or "This computer" to select whether you want to backup your iPhone to iCloud or your computer.
  6. Click Back Up Now to backup your iPhone.
  7. When the backup is complete, you'll see the time and date updated under Latest Backup.

Backup Your iPhone Using Finder (Macs Running Catalina 10.15 or newer)

  1. Connect your iPhone to your Mac using a charging cable.
  2. Open Finder.
  3. Click on your iPhone under Locations.
  4. Click the circle next to Back up all of the data on your iPhone to this Mac.
  5. Click Back Up Now.
  6. When the backup is complete, you'll see the time and date updated under Latest Backup.
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6.

DFU Restore Your iPhone

A DFU restore has the potential to fix software problems by completely erasing the code which may be causing your problem. The code is rewritten as if your iPhone is brand new, so the software problem may get solved.

Think of it like a house that has cracks in the foundation. Rather than try and fix the cracks, we are building an entirely new foundation.

If you can, back up your iPhone before completing a DFU restore. Any time you do a restore, it erases everything from your iPhone. However, after the restore is completed, you restore all your backed up data back onto your iPhone.

How Do I DFU Restore My iPhone?

How To DFU Restore An iPhone SE, 6s, Or Older

  1. Using a Lightning cable, plug your iPhone into a USB port on your computer.
  2. Open iTunes if you have a PC or Mac running Mojave 10.14 or earlier. Open Finder if you have a Mac running Catalina 10.15 or newer. It doesn’t matter if your iPhone is on or off.
  3. Press and hold the Home button and the power button simultaneously.
  4. After 8 seconds, release the power button, but continue to hold the Home button.
  5. Let go of the power button when your iPhone appears in iTunes or Finder.
  6. Your iPhone’s display will be completely black if you’ve successfully entered DFU mode. If it’s not, try again from the beginning.
  7. Restore your iPhone using iTunes or Finder.

How To DFU Restore An iPhone 7 Or 7 Plus

  1. Using a Lightning cable, plug your iPhone into a USB port on your computer.
  2. Open iTunes if you have a PC or Mac running Mojave 10.14 or earlier. Open Finder if you have a Mac running Catalina 10.15 or newer. It doesn’t matter if your iPhone is on or off.
  3. Press and hold the power and volume down button simultaneously.
  4. After 8 seconds, release the power button, but continue to hold the volume down button.
  5. Release the volume down button when your iPhone appears in iTunes or Finder.
  6. You'll know your iPhone is in DFU mode if the display is completely black.
  7. Restore your iPhone using iTunes or Finder.

How To DFU Restore An iPhone 8 Or Newer

  1. Connect your iPhone to your computer using a charging cable.
  2. Open iTunes (PCs and Macs running macOS 10.14 or older) or Finder (Macs running macOS 10.15 or newer).
  3. Quickly press and release the volume up button.
  4. Quickly press and release the volume down button.
  5. Press and hold the side button until the screen goes black.
  6. When the screen goes black, press and hold the volume down button while continuing to press and hold the side button.
  7. Hold both buttons for five seconds.
  8. After five seconds, release the side button while continuing to hold the volume down button.
  9. Keep holding the volume down button until your iPhone appears in Finder or iTunes.
  10. Restore your iPhone using iTunes or Finder.
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7.

Repair Your iPhone With Apple

Apple repairs iPhones at the Genius Bar in Apple Stores and through their online mail-in repair service. Apple repairs are high-quality, but out-of-warranty repairs can be much more expensive than third-party solutions. If you're looking to save some money you're not covered by Apple's warranty, you may want to check out our other recommendations.

How Do I Repair My iPhone With Apple?

How To Repair Your iPhone With Apple's Mail-In Service

  1. Visit Apple's support website to begin the online mail-in repair process.
  2. Alternatively, call 1-800-MY-APPLE (1-800-692-7753) to set up a repair.

How To Repair Your iPhone At The Genius Bar Inside Your Local Apple Store

  1. Visit Apple's website to make a Genius Bar appointment before you go into the store. Apple Stores are extremely busy, and if you don't have an appointment, you may have to wait for hours or end up being turned away. (Editor's note: I'm a former Apple tech and we're not exaggerating — please, do yourself a favor and make an appointment first!)
  2. When you arrive, go to the Genius Bar to check in for your appointment.
  3. Genius Bar appointments always include free diagnosis. If you're under warranty, many repairs can be done on the spot, but it all depends upon which parts are in stock. If you're not under warranty, the Genius will give you a quote for the cost of a repair.
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Cool As A Cucumber!

Your iPhone 8 has cooled off and you can start using it again! We hope you'll share this article on social media so your friends and family can understand why an iPhone 8 gets hot. Thanks for reading and feel free to leave a comment down below if you have any other questions.

  1. Restart Your iPhone
  2. Close Out Of All Of Your Apps
  3. Update iOS On Your iPhone
  4. Reset All Settings
  5. Back Up Your iPhone
  6. DFU Restore Your iPhone
  7. Repair Your iPhone With Apple

Applies To: iPhone 8

AUTHOR

David Lynch

David Lynch is an expert on cell phones, cell phone plans, and other tech. After using a flip phone into his early 20s, he learned the ropes about iPhones and Androids from a former Apple employee. Today, his articles and videos are read and viewed by millions, and he has been cited by major publications including Reader's Digest, Wired, CMSWire, Consumers Advocate, and more.

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Muhammad Rizwan
Muhammad Rizwan
6 years ago

Hi…i just started my brand iphone 8..after starting it suddenly shut down and it gets hot…now its cool down but not powering on…plzzz guide me

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