3-4 Serious Hard — consider a tech

Chamberlain Garage Door Opener 3-4 — Reversal during close not detected properly

Chamberlain Garage Door Opener · Error code 3-4

What 3-4 Means

The opener detected an unexpected force or stop during the close cycle and could not verify reversal. Often related to motor RPM feedback or force-learning issues.

Symptoms

  • 3 flashes then 4 flashes
  • Door stops mid-close
  • Possible chattering at end of travel

Common Causes

1
Force settings out of calibration

Up/down force not learned for current door weight.

2
Door binding intermittently

Sticky roller or hinge.

3
RPM feedback intermittent

Same root cause as 3-3.

How to Fix It

  1. Manually cycle the door to check for binding.
  2. Lubricate all hinges and rollers.
  3. Re-learn travel and force from the adjustment buttons on the motor head.
  4. If error returns, have the logic board diagnosed.

Parts You May Need

If diagnosis points to a failed part, these are the common replacements. As an Amazon Associate we earn from qualifying purchases.

Common replacement Garage door lubricant View on Amazon→

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.