I was using DESS since the start of the feature and it was working okay.
After the winter now more sun is here and I checked the system if it’s working. I analysed, that the system is not following the DESS setpoints. Instead it’s working in a dumb way without DESS. In the VRM portal DESS was active and the setpoint curve was shown. But in the remote console parameters of DESS the state was “inactive” and no setpoint.
I restarted the Multiplus system, but no change. I tried to turn DESS on the remote console OFF and ON, but no change. Then I deactivated DESS in VRM and this was working. DESS in VRM is now OFF and also the parameters in the remote console are invisible. But afterwards I was not able to activate DESS anymore. I made restarts and wait a day and then restarts and activation. But no effect. I activate the slider for DESS, get the success info but then the slider for DESS in VRM changes always to red and no DESS menu in the remote console.
There is no alarm in the whole system.
In the event log I have the event, that “Dynamic ESS settings updated”.
What can I do to re-activate DESS?
I found a solution for my problem:
Problem was the Beta-VRM Portal via broswer. I tried the normal VRM Portal and could activate DESS, change parameters and now I see also the DESS parameters via the Remote Console. And the DESS setpoint is also used by the system. So, everything okay now! 
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