Troubleshooting the LiftMaster Error Code 4-3 | A Step-by-Step Guide

Is your garage door acting up and displaying error code 4-3? Don’t worry; we’ve got you covered. In this guide, we’ll explain why this error is occurring, what behaviors your door/opener might exhibit, and provide symptoms and resolutions based on LED lights. Plus, we’ll share some valuable prevention and maintenance tips to keep your garage door running smoothly.

Why the Error is Occurring

The error code 4-3 indicates a “Loss of RPM during DOWN travel.” This means that there is an issue with the garage door’s downward movement, specifically with the motor’s speed or performance.

Behaviors of the Door/Opener

When this error occurs, you may notice the following behaviors of your garage door/opener:

• The garage door stops and reverses before touching the garage floor.
• It returns to the open position without closing completely.

Symptoms and Resolutions Based on LED Lights

To address the 4-3 error code, follow these steps:

Symptoms:

• Diagnostic Code of 4-3.

Resolutions:

1. Loose Travel Module Assembly:
   • Symptom: Check the mounting tabs and screws to ensure a snug fit between the travel module and the motor/bracket.
   • Resolution: Tighten any loose mounting tabs or screws to secure the travel module in place.
2. Loose Travel Module Wire(s):
   • Symptom: Examine the connection points of the travel module wires to ensure a snug fit.
   • Resolution: If you find any loose connections, repair or replace the wire harness as needed to establish a secure connection.

Prevention and Maintenance Tips

Preventive maintenance can help you avoid garage door issues like error code 4-3. Here are some tips to keep your garage door in tip-top shape:

• Regular Inspections: Perform visual inspections of your garage door and opener components. Look for loose screws, damaged wires, or any signs of wear and tear.
• Lubrication: Apply lubricant to the moving parts of the garage door, such as hinges, rollers, and tracks, to reduce friction and ensure smooth operation.
• Tighten Hardware: Periodically check and tighten all nuts, bolts, and screws on the door and opener.
• Sensor Alignment: Ensure that the safety sensors are aligned correctly and free from obstructions. Misaligned sensors can cause your garage door to reverse unexpectedly.
• Professional Maintenance: Schedule annual maintenance with a professional garage door technician. They can perform a comprehensive inspection and make any necessary adjustments or repairs.

Conclusion

In conclusion, understanding why the error code 4-3 occurs and being aware of the associated behaviors can help you troubleshoot and resolve the issue. Regular maintenance and preventive measures are key to keeping your garage door functioning smoothly and avoiding future problems. If you’ve followed these steps and the issue persists, it’s advisable to consult a professional garage door repair service for further assistance.