Hi Joerg,
I will try that tomorrow as I am away from home at the moment.
I found another message on the site that could be related: Imaginäres Klingelereignis am BellRFID
When I had removed the bellbuttons yesterday I already had a look at these arrows, however the arrows were hard to distinguish. I have now inserted them the other way around just for testing. Apparently it does not make any difference. It is strange that this has worked for so many years without a problem. It is also not clear to me how the direction makes any difference, the buttons look quite symmetrical.
On a related note: what is the maximum thickness of the paper that is inserted in the bellbutton. Now it is a heavy duty paper.
I will do a test tomorrow with the bellbutton removed (if it doesn’t rain…). The problem is also that sometimes several hours go by without the bell ringing and then suddenly it rings twenty times in a row…