LiftMaster Opener Error Code 1 flash: Meaning and Fix
Also shown as: One flash, LED blinks once
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 1 flash
- A cut or loose sensor wire
- Loose terminal
- Staple damage
- Missing sensor
How to fix it
- Check both sensors have power lights.
- Trace the wire.
- Reseat terminals.
- Repair damage.
- Test.
Parts you may need
| Part | Part no. | Buy |
|---|---|---|
| Safety sensor kit | 041A5034 | 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 does one flash mean on LiftMaster?
A broken or disconnected sensor wire.
Door will not close?
Yes, until the wire is fixed.
Which wire?
Check the pair from the opener to each sensor.
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.