Step 1: Check Mute / Unmute Setting
How to Check and Change Mute Status
Mute the lock
Wake up the outside keypad so it lights up.
Press and hold [0] (Mute button) for 2 seconds.
Listen for the voice prompt: “Mute mode enabled.”
Unmute the lock
Wake up the outside keypad so it lights up.
Press and hold [0] (Mute button) for 2 seconds.
Listen for the voice prompt: “Voice prompt enabled.”
Result:
If the lock was muted, unmute it and test the sound.
If the lock is already unmuted but there is still no sound, proceed to Step 2.
Step 2: Check Volume Settings
How to Adjust Volume Level
Press [*] twice to enter Master Mode.
Enter the Master PIN, then press [#] to confirm.
Press [2] to enter System Settings.
Press [2] again to enter Volume Settings.
Select the volume level:
[1] → Higher volume
[2] → Lower volume
[3] → Mute mode
Press [*] repeatedly to return to the previous menu until you exit Master Mode.
Attention: The default setting is higher volume.
Result:
If the volume was low or muted, increase it and test the lock.
If the volume is already set to high but there is still no sound, proceed to Step 3.
Step 3: Check Battery Level
Replace the batteries with a sufficiently charged spare lithium battery and retest the lock.
➡️ If the issue persists, proceed to Step 4.
Step 4: Perform Factory Reset
**Note: This will erase all user data and reset the master PIN to 12345678.
Factory Reset Steps
Remove the battery cover.
Double-press the RES button using a pointed object.
Listen for the voice prompt: “Restored to factory settings.”
Reprogram all PINs, fingerprints, and key tags.
Test the lock.
➡️ If the issue persists, proceed to Step 5.
Step 5: Warranty & Technical Escalation
Proceed with the Warranty Claim & Technical Escalation procedure