How to Lock Eufy Smart Lock from Outside

In this post, I’m going to walk you through the steps to lock your Eufy smart lock from the outside. If that sounds like what you’re looking for, let’s dive in!

There are different ways to lock your Eufy smart lock from outside. In this guide, I’ve covered 3 easy ways to lock your Eufy lock from outside in seconds.

Table of Contents

Locking Your Eufy Smart Lock from Outside

Method 1: Using a Passcode

Here are the steps to follow to lock your Eufy smart lock from outside using the passcode you set:

Tap the keypad area with your palm to wake up the keypad—the keypad should light up now.
Enter your passcode. Next, press the Check button on the keypad to confirm the code you entered.
If your passcode is correct/valid, the lock will lock.

Note: You can also use this method to unlock the lock from outside.

Method 2: Using the Auto-Lock Feature

If you’ve enabled the auto-lock feature on your Eufy smart lock, the lock will automatically lock after a few seconds once the door is closed.

You can also set how fast you want the lock to auto-lock when the door closes.

If you’re not sure how to enable auto lock on your Eufy lock, I’ve explained the process here, including troubleshooting tips.

Method 3: Using the One-Touch Locking Function

If your Eufy smart lock has the One-Touch Locking feature, you can lock it from outside by pressing the Lock/Cancel button on the keypad.

However, you may need to enable One-Touch Locking on the eufySecurity app to get it to work.

Here’s how to enable One-Touch Locking function:

Open the app on your mobile device and navigate to the lock tab. Then tap Settings.
You’ll see One-Touch Locking below Auto Lock. Toggle it to the right to enable the feature.

Now you can lock your door by long-pressing the Lock/Cancel button on the keypad.

Troubleshooting Eufy Smart Lock Locking/Unlocking Issues

If you’re having trouble locking/unlocking your Eufy smart lock from outside, here are some troubleshooting tips to help you resolve the issue:

Recharge or Replace the Batteries

If your lock doesn’t have enough power, its performance may reduce—and this could be the reason you’re not able to lock/unlock it.

If you’re using Eufy smart lock T8500, T8501, or T8510, these models use 4 AA batteries. So, you’ll need to check the batteries and replace them. Make sure you insert new batteries correctly, observing the correct battery polarity marking (+/-).

And if you own the Eufy smart lock T8520, this model uses a rechargeable battery with a 10,000mAh—expected to last up to 12 months.

For this lock, you’ll need to charge the battery instead of an outright replacement. Remove the battery from the lock and charge it using a micro USB and 5V/2A charger. It takes approximately 6-7 hours to recharge the battery to full capacity.

However, if you’ve used the lock for a little over 10 months, you may consider replacing the battery.

Make sure your lock has enough power, whether it means recharging or replacing the battery.

Next, try to lock/unlock your door from outside to see if it works. If not, continue to the next step.

Reboot Your Lock

If you’ve ensured that the lock has enough power but the problem persists, try rebooting it. Sometimes, a quick reboot might be all you need to fix internal glitches obstructing the locking process.

You can reboot your Eufy smart lock by pressing and holding the reboot button for about 10 seconds. The reboot button is located at the bottom of the lock, close to the micro USB port.

Allow the lock to fully boot up before you try locking it again—using your passcode.

If it still doesn’t work, continue to the next step.

Check that the Lock has the Latest Firmware Version

You may experience some malfunctions with your Eufy smart door lock if it’s not running on the latest firmware version.

New firmware versions are released periodically to enhance the lock’s performance and fix some glitches. So, check and update the firmware version of your lock to see if it resolves the problem.

Here’s how to check and update your Eufy smart lock firmware version:

Open the Eufy Security app on your mobile device. Make sure the lock is connected to Wi-Fi.
Locate the Lock in the app and tap the device tab. Next, tap Settings (gear icon).
Select General, then About Device.
Now tap System Version. If your lock has a new firmware version, you’ll see it on the screen. Follow the instructions on the screen to update it.

Reinstall the Lock

If you’re still having trouble locking/unlocking your Eufy smart lock, incorrect installation could be the culprit.

One common cause of this issue is incorrect door handing. So, you’ll need to remove the lock from the door and reinstall it, ensuring the latch and other components are set to match the door swing—left or right.

Related: How to Fix Eufy Smart Lock Offline Issues.

Wrapping Up

As you can see, locking your Eufy smart lock from the outside is a straightforward process. Once you enter your valid passcode and hit the Check button, the lock will lock instantly.

You can also use your fingerprint to lock and unlock the door, depending on the model of your Eufy smart lock.

If you experience any unusual difficulty while trying to lock your door, the troubleshooting tips above should help you resolve the problem.

Finally, contact Eufy support if you’re not able to unlock/lock the lock