Its green light signalled that it was working, but the remote control wouldn't open the door. Following instructions on the Internet for a similar garage door opener, I futzed with the "learn" feature to restore the pairing.
Not only did the remote still not work, but the built-in remotes on two cars stopped working, too, because I had erased all the pairings.
A three-minute battery replacement has resulted in a cascade of problems that will require several hours to research and execute the exact instructions for each remote.
If you live long enough you'll encounter problem cascades: erasing important files when performing computer maintenance, collapsing a bathroom sink while replacing a faucet, replacing a faucet (on a different occasion) and causing a leak that required shutting down the water to the house and calling in professional help.
In the scheme of things the current problems are minor ones. There was no swearing, just some sighing, and I know what I'll be doing Wednesday morning.
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