Have a Chamberlain GDO Model 1345 and cannot program L- 3: Changed the batteries, returned the remotes and got new ones, still do not work.
Learn button is purple. Followed all instructions and NEVER got a SOLID light on remote - only flashing. Hit the learn button, pressed and held the remote button, motor unit light never blinked, never heard 2 clicks. Wasted several hours.
Could you please see video below on how to change working mode.
And let me know if you have any questions, thanks.
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