When using the FamilLock S3 Max, if the Palm Vein Unlocking feature is not working (meaning the sensor isn't triggered), it might be due to the following reasons:

Possible Reasons and Solutions

1. Rain Mode Triggered

• Cause:

  • If there are plants or flowers near the lock, or during rainy weather, the lock might automatically enter “Rain Mode”. To reduce power consumption, the system may temporarily shorten the radar's wake-up distance or disable the radar wake-up function entirely.

• Solution: 

  • Press the “Confirm” button directly on the lock handle to manually wake up the palm vein scanner.

• If the lock is frequently exposed to humid or rainy conditions, it is recommended to periodically check if the lock is functioning normally, or simply wait for the system to automatically return to normal operation after the rain stops.

2. Sensor Not Triggered Correctly

• Cause:

  • The lock's radar sensor might fail to detect your palm due to environmental interference (such as obstructions blocking the sensor) or if your palm is too far away from the sensor.

• Solution: 

  • Ensure your palm is held at a distance of 10-15 cm (4-6 inches) from the sensor. (Note: Children's smaller palms may need to be held closer, around 4-6 cm (1.6-2.4 inches).

• Remove any obstacles or potential sources of interference near the lock sensor (e.g., hanging decorations, strong electromagnetic devices, etc.).

Summary of Operational Steps

• Check Environmental Factors: 

  • Remove any nearby plants or flowers that might interfere with the sensor.

• Confirm if the lock is currently exposed to rain or high humidity (which might trigger Rain Mode).

• Manually Wake the Sensor: 

  • Gently press the “Confirm” button on the lock handle to trigger the palm vein scanning interface.

• Ensure Proper Sensor Function: 

  • Clean any dust or water stains from the sensor surface.

• Confirm the lock's firmware is updated to the latest version.

Related Resources

• Demonstration Video of Common Palm Vein Registration Errors: https://eufy-security-pr.s3.us-west-2.amazonaws.com/overall/T85V0_palm_errors.mp4

• Video Example of Incorrect Operation: https://eufy-security-pr.s3.us-west-2.amazonaws.com/overall/T85V0_palm_errors.mp4

If you have any other questions about the FamilLock S3 Max, please don't hesitate to contact eufy Support Engineers for further assistance.