How to Fix Apple Watch ECG Not Working

What to Know

  • The Apple Watch ECG app takes a recording of your heart’s electrical pulses.
  • If the Apple Watch ECG is not working, try restarting your device and cleaning the Digital Crown.
  • You should also double-check that ECG has been set up in the Health app.

The Apple Watch ECG is one of the most useful apps you can have on your device. You can use it to keep track of your heart health and share the results with your doctor. However, if the ECG is not working, you won’t be able to see the results you need. Here’s what you can do to fix it.

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What Is ECG on Apple Watch?

apple health app ecg screen displaying the question, "how does the ECG app work?" along with an explanation on the apple watch ecg app

ECG stands for electrocardiogram and is a way to measure your heartbeat. The Apple Watch Series 4 and newer can record an ECG. According to Apple, this feature takes a reading of the electrical pulses that make your heart beat to ensure the rhythm of your heart rate is normal.

How to Fix Apple Watch ECG Not Working

If your Apple Watch ECG is not working, there are a few troubleshooting steps you can take. For more Apple Watch troubleshooting solutions, be sure to sign up for our free Tip of the Day newsletter. Now, let’s get started with finding out how to fix it when your Apple Watch ECG is not working.

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Restart Apple Watch

apple watch power off menu with a red box around the power off slider

Troubleshooting why your Apple Watch ECG is not working begins with restarting the watch. Restarting your Apple Watch can often fix minor bugs and other issues.

Clean Digital Crown

apple watch ecg app displaying a heart symbol and instructions reading, "hold your finger on the crown."

When taking an ECG, you must make sure that the watch is snug against your wrist, then hold your finger against the Digital Crown. If the Digital Crown is dirty, your Apple Watch might have trouble reading your heart rate, so I recommend cleaning your Apple Watch.

Ensure ECG Is Set Up in Health App

apple health app ecg screen displaying instructions on how to take an ECG on the apple watch

ECG must be set up in the Health app before you can use it on your Apple Watch. Ensure you have set up this feature by going into the Health app, tapping the Browse tab, and then selecting Heart. You should see an option to set up Electrocardiograms. If it is already set up, you will see your most recent ECG reading instead.

Reset Apple Watch

iphone apple watch app watch info screen with a red box around unpair apple watch button

If all else fails, you can try resetting your Apple Watch. This will wipe all data on the watch. However, when you reset your Apple Watch, your iPhone will create a backup of the device so that you can restore it afterward.

After trying the above fixes, if you are still having trouble with your Apple Watch ECG not working, you may need to reach out to Apple Support or visit an Apple Store for further assistance. The problem may be hardware-related, in which case your device will need to be repaired. Next, find out how to use Apple Watch recovery tracking to check your heart rate recovery.


  • Can you check your heart rate on Apple Watch? Yes, the Apple Watch has a built-in heart rate sensor. Find out how to check your heart rate on Apple Watch outside of the ECG app.
  • How accurate is the Apple Watch's heart rate monitor? The Apple Watch can provide a fairly accurate reading of your heart rate, but can sometimes offer an inaccurate result.
  • If my ECG is normal, is my heart ok? While the Apple Watch can help check for atrial fibrillation, it is not a medical device. It cannot detect heart attacks, blood clots, strokes, or any other heart conditions. If you believe something is wrong with your heart, it is best to check with your doctor first and foremost.
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Author Details

Rhett Intriago's picture

Author Details

Rhett Intriago

Rhett Intriago is a Feature Writer at iPhone Life, offering his expertise in all things iPhone, Apple Watch, and AirPods. He enjoys writing on topics related to maintaining privacy in a digital world, as well as iPhone security. He’s been a tech enthusiast all his life, with experiences ranging from jailbreaking his iPhone to building his own gaming PC.

Despite his disdain for the beach, Rhett is based in Florida. In his free time, he enjoys playing the latest games, spoiling his cats, or discovering new places with his wife, Kyla.