6 ADT Door Lock Problems Troubleshooting (Solved)

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The smart home security industry has many big players, one of which is the ADT home security system. One of their many products is the ADT door lock, and while it has been proven reliable, it isn’t without its faults. 

So, if you’re having issues with your ADT door lock or are simply planning to get one for your smart home security, then this article is for you. It highlights 6 ADT door lock problems you should look out for and proven ways you can resolve them. 

Let’s begin!

troubleshooting adt doorlock problem

How to Add Code to ADT Door Lock

To add a code to your ADT door lock, follow these steps tailored to your specific System (Control or Pulse). 

Add user codes through the Control app to ensure they are reported and tracked by your ADT system. The process varies slightly between the two systems, but let’s take a look at them one by one:

If You Are Using the Control System

  1. Open your Control app on your smartphone or tablet.
  2. Tap the hamburger menu (three horizontal lines) in the app’s upper left corner.
  3. Select “Users” from the menu options.
  4. Find the user you want to assign a code to and tap the three dots next to their name.
  5. Tap “Edit” to modify the user’s settings.
  6. Tap the relevant option to assign the user to a specific lock. Here, you can enter or modify the user code that will unlock the door.
  7. Tap “Save” to confirm the changes.

If You Are Using the Pulse System

For the Pulse system, you must add the User Codes per the lock manufacturer’s instructions. 

This means the process might vary depending on the make and model of your lock. However, you must ensure your lock is linked to the Pulse app. Here’s how to do that:

  1. Open your Pulse app.
  2. Tap the Manage Devices tile or navigate through the menu if you don’t see the tile: Tap the hamburger menu in the upper left, then tap “Settings”, and finally, “Manage Devices”.
  3. Select “Add” to include a new device, in this case, your lock.
  4. Follow the on-screen prompts to link your device.

After your lock is connected to the Pulse system, refer to the lock’s manual for specific instructions on adding user codes directly to the lock. This process is not managed through the Pulse app itself but rather through the lock’s programming mode.

General Tips

  • Ensure you have Master User access to perform these actions, especially in the Control system.
  • Keep your app updated to avoid any compatibility or functionality issues.
  • If you encounter any difficulties, consult the user manual for your specific model of the ADT door lock or contact ADT customer support, which may provide additional guidance specific to your hardware.

Following these steps should help you successfully add a code to your ADT door lock, enhancing the security and convenience of your System.

How to Change My ADT Door Lock Code

Whether you want to change your master access code or a user access code, there are a few simple steps to follow.

Let’s break down the steps for clarity and ease of execution.

Changing the Master Access Code

Enter the Current Master Code

  • Press the star (*) key, followed by the number 5 key on the keypad.
  • Enter your current master code. Watch for the lock’s Armed red light to turn on, and the System yellow light to flash.
  • Repeat the process if the lock doesn’t respond, ensuring the correct master code is entered.

Press the Model-Specific Key

  • Refer to your ADT smart lock manual to find the model-specific code needed to reprogram your lock’s master code.
  • Enter this ADT reset code into the keypad for system confirmation.

Enter the New Master Code

  • Input the new master code, which should be a four- to eight-digit code different from the previous one.
  • Press the hashtag (#) key to program the new code into the ADT door lock.
  • Test the new master code to ensure it works.

Changing a User Access Code

Option 1: Using User Access Code-Identifier

Identify the User Code Position
  • Press the star (*) key and then number 5.
  • Enter the master code.
  • Select the access code identifier (numbers 01 through 32).
Change the User Access Code
  • Enter the new access code you wish to use.
  • Press the hashtag (#) key to complete the change.

Option 2: Deleting-Adding Method

To Delete an Existing User Code:

  1. Access Program Button
  • Remove the lock’s interior cover to locate the program button.
  1. Enter Master Code and Delete
  • Press the program button.
  • Enter the master code, then punch the Lock key and the access code you wish to change. Repeat this step.
  • Press the Lock key again to complete deletion. A green light and beep indicate the code has been deleted.

To Add a New User Code:

Press the Program Button
  • With the interior device exposed, press the program button.
Enter New User Code
  • Enter the master code and then the Lock key.
  • Input the new access code. Press the Lock key again to program it successfully.

And that’s it! By following the steps highlighted, you can change both the master access code and any user access codes on your ADT door lock, ensuring your security settings are updated to your current needs.

How to Reset ADT Door Lock

Resetting the lock will erase all the existing programming, including user codes and settings, so you will need to reprogram the lock and add user codes again after the reset.

To reset your ADT door lock, follow these steps carefully. 

  1. Access the Interior Assembly
  • Slide the cover-up on the interior side of your door lock to remove it and expose the interior assembly.
  1. Remove the Battery Pack
  • Carefully remove the battery pack from the lock to cut off its power supply.
  1. Press and Hold the Program Button
  • Locate the Program button on the interior assembly. Press and hold this button.
  • While holding the Program button, reinstall the battery pack into the lock. 
  1. Wait for the Reset Signal
  • Continue to hold the Program button for about 30 seconds. Listen for a beep and watch the LED indicator flash red, signaling that the lock is entering reset mode.
  1. Activate the Reset Process
  • Release the Program button and then press it once more. The LED indicator should flash both green and red several times, indicating the lock is performing the reset.
  • After pressing the Program button this final time, wait a few seconds for the lock to initiate the door-handing process. During this process, the latch bolt will extend and retract to determine the door orientation.

After completing these steps, your ADT door lock will have been successfully reset to its factory settings. 

Remember, all previous programming is erased, so it’s essential to reprogram your lock and add new user codes to ensure you and other users can access the door through the keypad.

ADT Door Sensor Not Working

Suppose your ADT door sensor is not working correctly. In that case, you can take several troubleshooting steps to address the issue. Follow these tips to identify and resolve the problem:

Replace the Battery

  • For wireless ADT door/window sensors, low battery power can impact performance or cause the sensor to stop working.
  • Replace the battery with a fresh CR1233 or CR2032 battery, depending on your device model.
  • To prevent false alarms, put your System in test mode. You can do this on MyADT.com or by calling 800-ADT-ASAP.
  • After replacing the battery, remove the System from test mode and reset the security system if necessary.

Inspect the Wiring

  • For hardwired door sensors, check for damaged or pinched wires that may be causing issues.
  • It is recommended to have an expert handle wiring issues to avoid further complications. If you’re not experienced, seek professional assistance.

 Restart the Sensor

  • Restart the sensor to troubleshoot potential malfunctions.
  • If the sensor has a restart/reset button, hold it for a few seconds until it reboots.
  • With no dedicated restart button, restart the sensor via the control panel by entering your code and hitting the off button twice.

Additional Tips

  • For wireless door sensors, ensure the cover is adequately secured. An improperly secured cover can cause issues, such as a tamper showing that the zone is faulted.
  • If you’ve recently replaced the door, check that the magnet is attached correctly.
  • The gap between the contact and magnet should not exceed 1/4 inch to prevent the point or zone from showing as “faulted.”

If Issues Persist

  • If the ADT door sensor continues malfunctioning after trying the above tips, consider contacting ADT Support for further assistance.
  • Explain the steps and any specific issues you’ve observed to facilitate troubleshooting.

Different factors can contribute to ADT door sensor issues, so it’s essential to go through these troubleshooting steps systematically. Start by replacing the battery, inspecting the wiring, and restarting the sensor. If problems persist, seek professional assistance from ADT Support.

ADT Door Lock Battery Low

If you are experiencing a low battery warning on your ADT door lock, follow these steps to address and resolve the issue:

Silence Low Battery Beeping

  • Look for a low battery warning on the touchpad, displayed as BAT, LOW BATT, or SYSTEM LO BAT.
  • For instructions specific to your panel, you may need to visit the “Silence Low Battery Beeping” page on the ADT website.
  • Follow the provided guidelines to silence the low battery alert.

Determine the Source of the Low Battery Signal

  • Suppose the warning is associated with a specific zone number. In that case, it indicates a low battery in a sensor (e.g., door sensor, smoke detector).
  • The low battery signal likely originates from the system battery if there is no zone number.

System Battery Recharging or Replacement

  • If your System has been running on battery power due to a recent outage, it may need recharging.
  • If the low battery persists 48 hours after restoring AC power, consider recharging the system battery.
  • Visit the “System Battery Replacement” page for guidance on recharging or replacing the battery.

Battery Type and Replacement

Recycling Old Battery

  • Visit the call2recycle website to find locations to safely and responsibly recycle your old lead acid battery for free.

Following these steps, you can address the low battery issue with your ADT door lock, ensuring proper functioning and security. If the problem persists or you need further assistance, consider contacting ADT Support for additional guidance.

ADT Door Lock Beeping

If your ADT door lock is beeping, it could be due to various reasons. Below are ways to identify and address the issue based on the specific cause:

Common Reasons for ADT Alarm Beeping

Low System Battery

  • If your ADT control panel indicates a low system battery, it needs replacement.
  • Purchase a replacement ADT alarm battery of the same type.
  • Turn off the power at the circuit breaker.
  • Open the control panel cover, unplug the old battery, and install the new one following the wiring diagram.
  • Turn the power back on, and the low battery light should go off.
  • Consider replacing the backup battery annually to prevent future beeping.

AC Power Outage

  • Check your home’s electrical circuit breaker and reset any tripped breakers.
  • If the power outage is widespread, contact your electric company to report it.
  • Conserve the backup battery by turning off nonessential devices.
  • Once power is restored, the beeping should stop within an hour as the battery recharges.
  • Maintain a fully charged backup battery for extended power outages.

Faulty Keypad, Sensor, or Connection

  • Inspect keypads for physical damage or disconnected wires.
  • Test doors/windows with sensors, ensuring they work correctly.
  • Check that motion sensors are not obstructed.
  • Verify that the cables between the sensors and the control panel are intact.
  • Refer to the equipment manual for device testing and troubleshooting instructions.
  • Contact ADT for remote assistance in diagnosing and resolving the issue.
  • Repair or replace any faulty security equipment to stop false alarm beeping.

Temporary Ways to Mute the ADT Alarm

If you need to mute the ADT alarm beeping temporarily, there are a few ways you can do that:

Press the Chime Button

  • Many ADT keypads have a “Chime” or “Silence” button that mutes beeping temporarily.
  • Note that the alarm system remains active.

Unplug the Siren

  • Open the control panel and disconnect the wires to the siren/speaker.
  • This will turn off audible beeping, but keypad alerts will still display errors.
  • Remember, these are temporary fixes; address the underlying issue causing the beeping.

Addressing the beeping of your ADT door lock involves identifying the specific cause and taking appropriate actions. 

Whether you’re replacing a low system battery, restoring AC power, fixing faulty equipment, or temporarily muting, resolve the underlying issue to ensure the continued effectiveness of your ADT alarm system. 

You can also consider seeking assistance from ADT support for remote diagnostics and resolution.


Here are six prevalent issues you may encounter with your ADT door lock, along with a guide for troubleshooting each one. If you face any of these challenges, you can refer to this guide for assistance with troubleshooting. 

However, if you encounter a step that you cannot handle alone, consider enlisting the help of a qualified technician or contacting customer support for further assistance.

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