4-3 Moderate Moderate DIY

Chamberlain Garage Door Opener 4-3 — Travel limits not set

Chamberlain Garage Door Opener · Error code 4-3

What 4-3 Means

Door travel limits have not been programmed, or the opener has lost them. Without learned limits the opener will not run a full cycle.

Symptoms

  • 4 flashes then 3 flashes
  • Door runs only while button is held
  • Door does not auto-stop at limits

Common Causes

1
New install with limits not programmed

Initial setup not completed.

2
Limits lost after extended power outage

Memory may need re-learn.

3
Travel module fault

Encoder cannot retain position.

How to Fix It

  1. Press and hold the Adjust button on the motor head until the up arrow LED comes on.
  2. Press and hold the up arrow until the door reaches the desired open position.
  3. Press the Adjust button again — the down arrow LED comes on.
  4. Press and hold the down arrow until the door is fully closed.
  5. Press Adjust one more time to save.
  6. Cycle the door twice from the wall control so the opener learns force.

More Chamberlain Garage Door Opener Codes

1-1 1-1 — Low voltage / wall control wire issue 1-2 1-2 — Wall control / safety wire shorted 1-3 1-3 — Door control wire issue / lock button stuck 1-4 1-4 — Safety sensors misaligned or obstructed 1-5 1-5 — Safety sensor wires reversed or shorted 1-6 1-6 — Safety sensor obstruction or wire fault

All Chamberlain codes → All garage door opener codes →

Verified against manufacturer documentation: chamberlain.com

Always unplug an appliance before servicing it. This guide is for informational purposes and is not a substitute for a qualified technician.