Check the camera lenses for smudges or film. Even a thin layer of dust can prevent the AI from mapping facial points correctly.
The last 8 digits (if applicable) often serve as a master override code. How to Fix ZKTeco Authentication Error on Biometric Devices zkteco authentication failure solution best
Never rely on one biometric. For every employee, store: Check the camera lenses for smudges or film
: Fingers that are too dry or too wet can lead to scan failure. Ensure hands are dry and place the finger firmly to cover the entire sensor area. How to Fix ZKTeco Authentication Error on Biometric
Persistent failures for specific users often indicate corrupted data rather than hardware faults. Re-enrollment
: A subtle but critical fix for login failures is ensuring your PC's keyboard input is set to English before entering credentials into management software, as other languages can cause character mismatches. How to Fix ZKTeco Authentication Error on Biometric Devices
| Symptom | Most Likely Cause | Best Immediate Solution | | :--- | :--- | :--- | | Failure for 1 user, others work | Damaged/old fingerprint | Re-enroll that user’s finger | | Failure for all users | Dirty sensor or low power | Clean sensor; check voltage (12V DC) | | Failure after power outage | Corrupted memory | Restore from backup or factory reset | | Face auth fails in morning only | Angle lighting change | Enable IR LEDs; re-enroll face at 1 meter | | Card auth fails | Wrong card format | Re-sync card UIDs via software |