Chamberlain Opener Error Code 3-3: Meaning and Fix
Also shown as: 33, Up 3 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 3-3
- A worn battery that will not accept charge
- A loose battery connector
- A failed charging section of the logic board
- Incorrect battery type installed
How to fix it
- Unplug the opener and disconnect the battery.
- Inspect the battery connector and clean any corrosion.
- Install a fresh battery and reconnect.
- Power up and watch the battery LED for 10 minutes.
- Replace the logic board if the code remains.
Parts you may need
Questions
What is 3-3 on a Chamberlain opener?
A battery backup charging fault.
Do I need a new opener?
No. Replace the battery first, then the board if needed.
Is the door still usable?
Usually yes on mains power; the backup just will not work.
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.