I have HD600 WhisperDrive garage door opener. All three of my remotes stopped working at the same time. Not a battery issue in the remotes. I tried reprogramming one remote, so pressed the learn button, but realized the light for the learn button was already on. It doesn't seem to turn off.
I cycled power on the opener, and the learn button blinked for a while, then went to steady green again. Resetting the remote failed.
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