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What Do The Garage Door Opener Flashing LED Codes Mean

The Chamberlain, Liftmaster & Craftsman garage door openers have a built-in diagnostic indicator that will assist you in troubleshooting your garage door opener.


There is a LED light next to the smart button (programming learn button) on the outside of the motor cover up above the antenna. The LED functions as a diagnostic indicator by slowly flashing a failure code continually every eight seconds until the fault is corrected, the garage door opener is reset, or the necessary parts are replaced.

  Observe the flashing LED & count how many flashes occur in a row between pauses. Then refer to the chart below for the cause of your garage door opener not working properly. Once you have fixed the problem the opener will reset itself for most issues. However note below on the last two failure codes it does require that you manually reset the opener by unplugging the unit. If you still can not get the opener functioning properly after following the steps below you should contact us for a service request to resolve the problem.


# of Flashes

Problem

Auto Reset

Manual Reset

1

Photo-Cell totally misaligned or Photo-Cell wire open

X

 

2

Photo-Cell wire shorted or the wire is reversed on the terminals

X

 

3

Wall button (panel) wire is shorted in wall or attic

X

 

4

Photo-Cell sensor sightly misaligned (dim or flashing LED on sensor)

X

 

5

Possible RPM sensor failure or motor overheated, unplug opener to reset unit

 

X

6

Motor circuit failure, replace main logic board

 

X

Rapid Flashing

This is not a problem but just an indicated that the opener is receiving a signal but it will not respond to an unauthorized code