I can see it on the system interface as "note" ("Hinweis") when the error is active. It says "EVU Sperre" and "C5". It is not visible in the ViCare App, neither when it is active nor in the history. Before I had to switch to the new API, it was shown as c5 among the historic errors when the "EVU Sperre" was active. As soon as it was not active anymore, it also disappeared from the list of errors. That made it very easy for me to poll for the current status of the "EVU sperre". For my application, a private energy consumption analysis tool, I do need to know when my electricity provider is de-activating my heating and when he is not. So, at the moment I have to add the periods of the "EVU sperre" to my database by hand. Don't get me wrong, the new API with its documentation is clearly a step forward, in general. But not being able to read out the C5 error would be a step backward for me.
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