Troubleshooting Liftmaster Error Code 1-2 | A Step-by-Step Guide

Is your garage door acting up and displaying the diagnostic code 1-2? Don’t worry; we’ve got you covered. This guide will help you understand why this error is occurring, what behaviors your garage door and opener are exhibiting, and how to resolve the issue based on the amber and green lights. Let’s get started!

Why the Error is Occurring

The error code “1 Up, 2 Down” is displayed when:

• The wires are reversed: The wires between the White and Black Terminals are connected incorrectly or reversed.
• There is a short in the wires: There might be a short circuit in the wires between the White and Black Terminals.
• Error persists for more than 4 seconds: The error code appears if the issue remains unresolved for an extended period.

Behaviors of the Door/Opener

When this error occurs, you may observe the following behaviors:

• The garage door starts in the fully open or stopped position.
• When the garage door begins to close, it reverses to the open position or doesn’t move and remains open.
• The Garage Door Opener will not close.
• The opener lights flash or click 10 times.

If there are no lights installed, you will hear the opener click while attempting to flash the lights.

Symptoms and Resolutions Based on LED Lights

To diagnose and resolve the “1 Up, 2 Down” error, pay close attention to the status of the LED lights on the Sending (Amber) and Receiving (Green) Sensors:

Amber LED off, Green LED off

• Symptom: Safety Sensors wires are shorted.
• Resolution:
  • Check if your home is pre-wired; if it is, ensure that the same color wires are connected to the sensors properly.
  • If the wires are reversed at the sensors in a pre-wired home, check the wires at each sensor and verify that the colors connected to the sensors are white and black.
  • If the wires are reversed at the opener in a pre-wired home, check the wires at the opener and ensure that the correct wires are connected properly.
  • If the wires are reversed at the opener in a non-pre-wired home, check the wires at the opener and verify that the wires are connected properly (white to white, black to black).
  • Check for staples in the wires; if found, perform a short wire test by wiring the safety sensors with a foot of wire. Replace the wires if the sensors work, or replace the sensors if needed.

Prevention and Maintenance Tips

• Keep the sensors clean: Regularly clean the sensors with a dry cloth to remove any dirt or debris that might be blocking the sensor’s view.
• Align the sensors properly: Make sure the sensors are aligned properly and facing each other to ensure proper communication.
• Check the wiring: Inspect the wiring between the sensors and the opener, making sure it is securely connected and not damaged.
• Test the sensors regularly: Test the sensors regularly by placing an object in front of them to make sure they are working properly.
• Keep the opener updated: If your opener has a firmware update, make sure you install it to ensure that it’s working optimally.
• Inspect the opener: Regularly check the opener for any signs of wear and tear, such as loose or broken parts, and have them repaired or replaced as needed.

By following these tips and performing regular maintenance, you can help prevent liftmaster error code 1-2 and ensure that your garage door opener is working properly.

Conclusion

Understanding and addressing the “1 Up, 2 Down” error code is crucial for ensuring the proper functioning and safety of your garage door. By identifying the root cause of the issue and following the recommended resolutions based on the amber and green lights, you can enjoy smooth and trouble-free operation of your garage door opener. If you encounter any challenges during the troubleshooting process, consider consulting a professional garage door repair specialist for assistance.