Craftsman 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. Craftsman openers follow the Chamberlain flash chart.
Craftsman garage door openers are made by the Chamberlain Group under license, so they share the LiftMaster and Chamberlain diagnostic codes. Look for a model number starting with 139. on the label. Check the model label on your unit before using any chart.
What causes 1 flash
- A cut or loose sensor wire
- Loose terminal
- Missing sensor
- Staple damage
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 Craftsman?
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 Craftsman 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.