Hello, I had a warning or warning symbol on my dashboard display this weekend. Since I did not find this symbol in my manual and I (and my wife) could not interpret the sign, I would like to contact the forum. A round, grey sign with a green dot and three vertical “spirals”. What should I fill up or observe? The symbol has disappeared again. The picture should only indicate the place and the approximate appearance. The vertical strokes are (heating) spiral-shaped. Please no comments on the artistic value.