LiftMaster Opener Error Code 4-3: Meaning and Fix
Also shown as: 43, Up 4 Down 3
Reading the opener display
A garage door opener reports faults through blinking LEDs on the motor head, a diagnostic window on the logic board, or the wall control. Count the flashes slowly and repeat the count before you decide what you saw. On LiftMaster the Learn button color and the count of flashes together identify the board.
LiftMaster, from the Chamberlain Group, is the professional-installer line. Its openers with a yellow Learn button report faults as LED flash counts or two-digit diagnostic codes such as 1-1 or 4-5 on the logic board. The codes apply to model numbers such as 8500W and 87504-267; check the label on your unit to confirm yours.
What causes 4-3
- Close force too low
- A door that drags on weatherstripping
- Binding or misaligned track
- Travel limit short of the floor
How to fix it
- Clear the floor line of debris and ice.
- Check the seal for dragging.
- Adjust the down limit slightly.
- Inspect track alignment.
- Retest and adjust force a little.
Parts you may need
| Part | Part no. | Buy |
|---|---|---|
| Travel module kit | 041D8071-4 | Find part |
Part numbers are OEM references; confirm fit by your model number before ordering. Some links are affiliate links; we may earn a commission at no extra cost to you.
Questions
What is 4-3 on a LiftMaster garage opener?
The door reversed before touching the floor due to resistance.
Is the safety eye involved?
Not for 4-3; this is force related.
How much should I adjust?
Small steps, then retest.
Other LiftMaster opener codes
Sources
Part numbers are OEM references; confirm fit by your model number before ordering. Meanings compiled from manufacturer and parts-retailer documentation; see sources below. Unplug the appliance before opening it.
Applies to models including 8500W, 87504-267, LJ8900W, 2265, 2280, 1240R, 1345, 8075.