1. Function Overview

2. Working Principle

1. Automatic Locking (supports door position detection)

2. Timed Locking (does not support door position detection)

3. Setup Method

4. Explanation of Automatic Locking Time for Different Models

5. Frequently Asked Questions and Solutions

1. Function Overview

The Auto-Lock (Automatic Locking / Timed Locking) function on eufy Smart Lock models is designed to enhance home security and user convenience. It addresses security risks caused by users forgetting to lock the door or leaving for a short period. Please note that the Auto-Lock function has two modes:

• Automatic Locking (door position must be confirmed): The Smart Lock will determine if the door is completely closed. After completing the actions “Unlock → Open → Close,” a timer for automatic locking will start, ensuring that the door locks only after it is completely closed.

• Timed Locking (without checking door position): After the Smart Lock is unlocked, it instantly starts a countdown timer and automatically locks the door after the user-specified time, regardless of whether the door is actually closed.

2. Working Principle

1. Automatic Locking (supports door position detection)

• Hardware Dependence: Geomagnetic sensor + Gyroscope.

• Action Logic: After completing the actions “Unlock → Open → Close,” the Smart Lock verifies that the door is completely closed, initiates the countdown, and automatically locks when the timer runs out.

• Timeout Compensation: If the door is not recognized as completely closed for an extended time (e.g., sensor malfunctions or the door remains partially open), a timer will initiate, usually lasting 3 to 5 minutes (see the table below for details).

• Applicable Models: T85P1, T85V0/T85V0C, T8530, T8520, and T8520P/T8510P (see the table below for details).

2. Timed Locking (does not support door position detection)

• Hardware Dependence: None.

• Action Logic: After every successful “unlock action,” the Smart Lock immediately initiates a countdown according to the set duration (such as 30 seconds, 3 minutes, etc.), and automatically locks the door when the timer runs out, regardless of whether the door is completely closed or not.

• Applicable Models: T85P0, T85F0, T85F1, T85D2, T85D0, T85L0, T8531, T8506, and T8502 (see the table below for details).

3. Setup Method

The eufy app can be used to complete the setup process, and the operational steps are as follows:

1. Enable the Auto-Lock Function: Go to the device details page → select “Settings” → select “Auto Lock.” Keep in mind that this function is disabled by default and needs to be enabled manually.

2. Configure Lock Duration: After enabling the Auto-Lock function, select “Timer,” with duration options varying by model (ranging from 1 second to 60 minutes, where 30 seconds is the minimum adjustment increment).

3. Set Up Schedule (optional): Enable the Schedule function, define the active time period for automatic locking (default is from 23:00 to 06:00), and the Auto-Lock function will not work outside this period.

Note: The Schedule function of the T8502 model is unique compared to other models and is solely used for automatic timed locking/unlocking. If set to operate between 23:00 and 06:00, it will automatically unlock at 23:00 and lock at 06:00, without interfering with the daily Timed Locking function during these hours.

4. Explanation of Automatic Locking Time for Different Models

eufy Smart Lock models are divided into automatic locking with door position detection and timed locking without door position detection categories, with specific models and designated time intervals as follows:

Note: The Schedule function of the T8502 model is unique compared to other models and is solely used for automatic timed locking/unlocking.

5. Frequently Asked Questions and Solutions

Question 1: What should I do if the Auto-Lock function is not working correctly or the time setting is wrong?

• Possible Cause: Door is not closed completely, sensor misalignment, inability to fully detect door opening and closing actions, or outdated firmware version.

• Solution:

  • Ensure the door is completely closed and unobstructed, then recalibrate the Smart Lock (eufy app → Settings → Lock calibration).

  • Test the complete “unlock → open door → close door” sequence.

  • Update the Smart Lock to the latest firmware version (eufy app → Settings → Firmware update).

Question 2: What should I do if the door locks even when it is not completely closed?

• Possible Cause: To extend battery life, the Smart Lock includes a low-energy enforced locking mechanism that activates automatically after a specified duration.

• Solution: If you have concerns regarding potential security risks, you can disable the Auto-Lock function in the app by going to Settings → Auto Lock. 

Question 3: What should I do if timed locking is ineffective or the scheduled duration is fails?

• Possible Cause: Incorrect time zone settings on the device/phone or failure to update the firmware version for daylight saving time.

• Solution:

  • Make sure the time zones on the phone and the Smart Lock in the app match.

  • Verify the Smart Lock’s firmware is updated to the latest version.

  • If the issue continues, upload your device logs via the eufy app by going to Settings → About → Upload log, and contact eufy Support Engineers for further assistance.

Question 4: What should I do if my Smart Lock still functions abnormally after calibration?

• Possible Cause: Sensor malfunction or faulty connection to the main circuit board.

• Solution: Record a video demonstrating the Smart Lock's working status, upload your device logs via the eufy app by going to Settings → About → Upload log, and contact eufy Support Engineers for further assistance.

If you have any other questions about the Auto-Lock function, please don't hesitate to contact us for further assistance.