Bluetooth and Electronic Lock Support

How do I replace the battery on my Master Lock 4901 biometric padlock?

1. Remove the bottom cover.
2. Use a coin to turn the battery door slot 90 degrees counterclockwise. Open the battery door & remove old battery.
3. Install a new CR2 battery with positive side facing right.
4. Close the battery door, turn the slot back 90 degrees clockwise & replace bottom cover.

How do I retrieve my lock's unique backup master code?

The unique backup master code can only be found in the Master Lock Vault Home app once the lock is registered.

How do I remove fingerprints from my Master Lock biometric padlock?

To remove a user, you must begin with the padlock locked.

To remove all primary users:

1. Enter the preset code or open the padlock with your primary fingertip.
2. With the padlock open, press and hold the UP arrow until the blue LED turns purple. Release the up arrow.
3. Press and hold the RIGHT arrow until the LED flashes green and red. All primary fingerprints are now removed from the padlock.

To remove all additional users:

1. Enter the preset code or open the padlock with your primary fingertip.
2. With the padlock open, press and hold the DOWN arrow until the blue LED turns purple. Release the down arrow.
3. Press and hold the RIGHT arrow until the LED flashes green and red. All additional fingerprints are now removed.

How do I add fingerprints to my Master Lock biometric padlock?

To add a user, the lock must begin in the closed position.

To add a primary user:

1. Enter the preset code onto the keypad and open the padlock.
2. With the padlock open, press and hold the UP arrow until the blue LED light turns purple. Release the up arrow.
3. Place your finger on the sensor and hold. The LED will change from blue to green.
4. Repeat finger placement four more times.
5. The LED will flash green three times when the print is registered. Be sure to close the lock and test it.

To add an additional user:

1. Enter the preset code or open the padlock with a primary fingertip.
2. With the padlock open, press and hold the DOWN arrow until the blue LED turns purple. Release the down arrow.
3. Place the user’s fingertip on the sensor and hold. The LED will change from blue to green.
4. Repeat finger placement four more times.
5. The LED will flash green three times when the print is registered. Be sure to close the lock and test it.

My Master Lock Bluetooth lock box will not relock. How can I fix this?

If your lock box door will not relock, you will need to unlock the door again using either one of the codes (Primary, Secondary or Temporary Codes) or Bluetooth from the App.

How do I open my Master Lock Bluetooth lock box?

You can open your Master Lock Bluetooth lock box by using Bluetooth or by entering a numeric code on the keypad.

My Master Lock Bluetooth lock box is showing the yellow “Low Battery” light. What should I do?

The yellow LED displays when your battery is low. You should replace it with a new CR123A battery.

How long will the batteries last on my Master Lock Bluetooth lock box? What should I do if the battery dies?

With normal usage, your lock box’s battery should last 2 years.

If the battery does die while closed, you can use an external battery to open the lock.

Where can I find the Activation Code for my Master Lock Bluetooth lock box?

The activation code for each lock box is in the upper left corner of the instructions provided in the packaging.

How do I replace the battery on my Master Lock Bluetooth Padlock?

The lock lights yellow to indicate that the battery is low. When the battery is low, you can install a new CR2450 battery in the model 4400 and a CR2 battery in the model 4401. With model 6400 you can install a new CR123A battery. Please note that it can take up to 72 hours for the yellow LED to turn off after replacing the battery.

My Master Lock Bluetooth padlock will not relock. What should I do?

Make sure no external debris can be seen in the shackle locking mechanism or shackle opening. Clear away any debris as necessary.

My Master Lock Bluetooth padlock buttons have frozen and I cannot operate it. What should I do?

Hold a gloved hand over the lock for a few moments to melt any ice that got into the button. After the ice melts the lock should function as normal.

Are Master Lock Bluetooth & biometric padlocks made for outdoor use?

The 4401DLH and 6400 Series Bluetooth Padlocks and the 4901DLH Biometric Padlock are designed for outdoor use.

How long does the battery last on my Master Lock Bluetooth padlock and what should I do if the battery dies?

With normal usage, your lock box’s battery should last 2 years.

The 4400 uses a CR2450 lithium button cell battery. This battery should last about 2 years with regular use.

The 4401 uses a CR2 lithium photo battery. This battery should last 5 years with regular use.

If the battery in your 4401 padlock dies while the lock is locked, use an external battery to operate the lock.

If the battery in your 4400 padlock dies while the lock is locked, use a CR2450 battery (the same as inside the lock) to operate the lock.

Where can I find the activation code for my Master Lock Bluetooth padlock?

The activation code is on the instruction sheet included in the lock’s packaging.