Chamberlain Opener Error Code 1-1: Meaning and Fix
Also shown as: 11, Up 1 Down 1, 1 flash 1 flash
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 1-1
- A sensor wire cut or pulled loose behind a door track or garage-door bracket
- A loose wire nut or terminal screw at the opener or at a sensor
- A sensor that was never installed or has been removed
- Staples or a screw penetrating the bell wire
How to fix it
- Look at both sensors by the door; each should show a lit indicator (one amber, one green).
- Follow the thin two-wire cable from each sensor to the opener and check for cuts, staples and kinks.
- Reseat the wires on the sensor terminals and the opener terminals (white/white-black pair, never swapped).
- Re-strip and reconnect any damaged length, or splice in new bell wire.
- Plug the opener back in and run a close cycle; the arrows should stop flashing.
Parts you may need
Questions
What does 1-1 mean on a Chamberlain opener?
It means the safety sensor circuit is open, usually from a loose or cut wire or a missing sensor.
Will the door close from the wall button?
Not normally. Holding the wall control can sometimes force a close on older units, but fix the wiring rather than relying on that.
Is this a pro job?
Usually not. Most 1-1 faults are a loose terminal or a damaged wire you can repair with a screwdriver.
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.