Attention:

In order to ensure the reliability we made several experiments with different EHEIM external filters and our EHEIM-Controller. We found out that under certain circumstances a safe operation can`t be guaranteed - the filter stops for so far unknown reasons!
I presume that a permanent communication causes issues in the filter electronics.
We and EHEIM will find a solution as soon as possible, until this has happened we please you:

Don`t use the EHEIM-Controller until we are able to offer a solution! If you are already using it then please disconnect it!

We are sorry for the possibly happened inconvinience and ask you for your understanding.