PL4 and EHEIM-Controller data exchange issue

[Demetr]

Hello!
Help me plz in resolving the following problem: the PL4 does not control the EHEIM 350e filter. The green LED on the EHEIM-controller lights on without blinking, the orange does not light up at all. The EHEIM 350e filter does not react on any changes in PL4 pump operational mode. How to establish a full-mode connection between the filter and PL4 and take control on filter via PL4?
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