Chamberlain 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. Chamberlain boards use the same flash chart as LiftMaster; the Learn button color matters.
Chamberlain makes the openers sold at home centers and shares its logic boards and diagnostic code tables with LiftMaster and Craftsman. The faults show as a flash count on the Learn LED or the motor-head display. The codes apply to model numbers such as B4505T and B2212T; 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 Chamberlain 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 Chamberlain 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 B4505T, B2212T, B6713T, B2202T, C2405T, RJO20.