Marantec garage door remote works only after battery removal/reconnect

Thread Starter


Joined Dec 28, 2020
I have several Marantec Digital 302 868.3 Mhz garage door openers.
After a few years they all get the same issue: when clicking the button, the LED still flashes but the door does not open
When I remove the battery and put it back in... it works again and it keeps working for a few hours
The next day the issue returns
Not all of my remotes have this issue, so I think the main controller is OK and the problem lies with those remotes
I have replaced the battery, cleaned the contacts and applied contact spray but no avail... it works for a few hours and then fails again
anyone any ideas?