When your Hornbill smart lock is not locking, tries to move a few times, and then starts beeping, this could be due to several factors like a mechanical obstruction, misalignment, or a software issue. It’s good that you’ve already ruled out the low battery as a potential cause. Let’s try the following steps:

1. Check Mechanical Obstruction: Inspect the deadbolt and door frame for any obstructions that might prevent the deadbolt from extending fully. Even a small resistance can cause the lock to fail and start beeping.
2. Check Door and Lock Alignment: The lock, door, and strike plate on the door frame must all align perfectly for the lock to operate properly. Misalignment, even if slight, can cause issues. Ensure the door is fully closed and the deadbolt can move freely into the strike plate hole.
3. Reset and Recalibrate the Lock: Try resetting the lock and setting it up again as if it was new. This process will often recalibrate the lock’s motor and can resolve issues like the one you’re experiencing. Refer to the user manual or the manufacturer’s website for specific instructions on resetting and recalibrating your specific Hornbill smart lock model.
4. Update Firmware: If your lock is connected to an app or a smart home system, make sure the lock’s firmware is up-to-date. Outdated firmware can sometimes cause these kinds of issues.
5. Contact Hornbill Support: If none of the above steps resolve the issue, contact Hornbill’s customer support. They can provide more detailed troubleshooting steps based on your specific lock model.

Remember, it’s important to maintain the proper functioning of your lock to ensure the security of your home. If you cannot resolve the issue, you might need to consider getting a professional locksmith involved.

For more Hornbill smart lock problems and troubleshooting, please check this article: Hornbill Smart Lock Troubleshooting: Step by Step Guide.