Hi Chio.
I Found out yesterday evening. I didn't read it with enough patience.
The article had a lot of good hints. Most likely it's a heatervalve ploblem. I always thought the valves were activated when they get power. But they seem to be open without power. That changes everything. It makes more sense now at least for a part. It's a good discription how you start simpel and eliminate one thing after another. Maybe I don't have to dig into the dashboard to change the steppermotors after all. Fingers croossed.
Second guess now is the control unit.
Very good workdiscriptions/video's done by you guys.
Thanks Henk.
No need to reply in English.
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