2-3 Moderate Moderate DIY
LiftMaster Garage Door Opener 2-3 — Open and close limits not set
LiftMaster Garage Door Opener · Error code 2-3
What 2-3 Means
The travel limits (where the door considers itself fully open and fully closed) have been lost or have never been set. Common after a board replacement or memory clear.
Symptoms
- Opener will not run at all, or only runs in short bursts
- Up arrow blinks 2, down arrow blinks 3
- After replacing logic board or unplugging for service
- Door does not fully open or close
Common Causes
1
Limits cleared after board swap
New or reset boards ship with no limits stored.
2
Power outage corrupted memory
Brownout or surge wiped saved limits on some models.
3
Reset button accidentally held
Yellow learn button or adjust button pressed long enough to clear settings.
4
Failed limit potentiometer (older models)
Mechanical pot for travel sensing has failed.
How to Fix It
- Identify your opener model — newer DC openers use up/down arrow buttons; older AC openers use screw-driver limit screws.
- For DC models: press and hold the adjustment up arrow until door reaches desired open position, release; press down arrow until door reaches closed position, release.
- Press the yellow learn button briefly to confirm — door will cycle once to verify.
- For older AC chain/screw drives: turn open and close limit screws to set travel points per the manual.
- Run a full open/close cycle and verify door fully opens and seals at the floor.
- Re-test safety reversal with a 1.5-inch block on the floor.
- Reprogram remotes if memory was lost.
More LiftMaster Garage Door Opener Codes
Verified against manufacturer documentation: liftmaster.com
Always unplug an appliance before servicing it. This guide is for informational purposes and is not a substitute for a qualified technician.