Hello josefa68,
your issue has been resolved in the meantime, as you described under your other post. 🙂
https://www.viessmann-community.com/t5/Waermepumpe-Hybridsysteme/New-Vitocal-111-S-expectations-slow-to-heat-radiators-high/m-p/200232#M35370
Many greetings
Flo
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