Chamberlain · Garage Door Opener Serious
3-4 — Reversal during close not detected properly
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.
- Keep using it?
- Limited use only
- DIY difficulty
- Hard
- Verified against
- chamberlain.com ↗
How to fix it
- Manually cycle the door to check for binding.
- Lubricate all hinges and rollers.
- Re-learn travel and force from the adjustment buttons on the motor head.
- If error returns, have the logic board diagnosed.
Why it happens
Typical signs: 3 flashes then 4 flashes · Door stops mid-close · Possible chattering at end of travel
- Force settings out of calibration Up/down force not learned for current door weight.
- Door binding intermittently Sticky roller or hinge.
- RPM feedback intermittent Same root cause as 3-3.
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.
- Garage door lubricant Common replacementAmazon →
More Chamberlain garage door opener codes
1-1 1-1 — Safety Sensors Obstructed/Misaligned/Disconnected 1-2 1-2 — Safety Sensor Wires Shorted or Reversed 1-3 1-3 — Door control wire issue / lock button stuck 1-4 1-4 — Safety sensors misaligned or obstructed 1-5 1-5 — Motor Drive / No RPM at Start of Movement 1-6 1-6 — Unexpected RPM After Stop at Open Position
Always unplug an appliance before servicing it. This guide is for informational purposes and is not a substitute for a qualified technician. Verified against manufacturer documentation: chamberlain.com.