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Maybe it's just a damp plug or corroded contacts. When it comes to sensors, a defect doesn't always mean "defective" in the sense of the sensor being broken. What it actually means is that the sensor isn't providing plausible readings. It could be broken, but it doesn't have to be.
You can try to email them to me, translation should not be a problem I think.
If it's a copyright issue, we or I can type it out and possibly rephrase it so there's no trouble.
But that's basically the point of the FAQ here in the forum: to make such things easily accessible.
@Gremblinas
I don't know how the sensor is connected to the control box, even though the sensor is installed inside. If there are cables or connectors leading outside, it could very well be water or corrosion on the connector contacts.
We frequently experienced this with our Fendt Favorit 310, 824, and Xylon 524 after washing or after heavy rain when the tractor had to be left outside. This would then result in an error message because, for example, the expected sensor voltage wasn't present.