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My remote garage door won't open, even if I change the battery. What should I do?

There are many reasons why it can't be opened, which can only be ruled out one by one. First of all, you must open the door, check whether the garage door control host is powered on, then open the shell and press the switch button of the control panel to see if the door works normally. If it's normal, it's the remote control. If it's not normal, it's the control panel. We must replace the control panel. Good luck.