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Nathan GonzalezSep 5, 2025
What to do if IP connection status "3" illuminates yellow on Viessmann Control Systems?
- Nnathaniel68Sep 6, 2025
If the IP connection status "3" shows a yellow light, it means there's an internet connection, but the Vitodata server is unreachable. To fix this, disconnect the plug-in power supply unit and reconnect it after about 15 seconds. This will trigger another connection attempt.