Home Fault Codes

Chamberlain Opener Error Code 4 flashes: Meaning and Fix

4 flashes
How 4 flashes appears on a Chamberlain opener display.
Chamberlain opener code 4 flashes: safety sensor with sunblocker
Chamberlain Group product image, chamberlain.com

Also shown as: Four flashes

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 flashes

How to fix it

  1. Clean lenses.
  2. Clear the beam.
  3. Realign.
  4. Tighten brackets.
  5. Test.

Parts you may need

PartPart no.Buy
Safety sensor kit041A5034Find part
Safety sensor bracket kit041A5266-3Find 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 4 flashes mean on Chamberlain?

Sensor alignment problem.

Why does the door reverse?

The beam is broken.

How to confirm?

Both LEDs should be solid.

Other Chamberlain opener codes

Chamberlain opener code Yellow Learn LED rapid flash: openerYellow Learn LED rapid flashStuck button on a remote or keypadChamberlain opener code 1-1: safety sensor pair1-1Safety sensor wire open or sensors not connectedChamberlain opener code 1-2: safety sensor1-2Safety sensor wire shorted or reversedChamberlain opener code 1-3: wall control panel1-3Door control wire shortedChamberlain opener code 1-4: safety sensor with sunblocker1-4Safety sensors misaligned or beam blockedChamberlain opener code 1-5: travel module1-5Travel module or RPM sensor fault

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.