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Isabella AdamsSep 1, 2025
What to do if the Viessmann Vitocom 100 yellow LED is permanently on?
- SSue ThompsonSep 1, 2025
If the yellow LED on your Viessmann Remote Control is permanently on, it means that a dial-in to the GSM mobile phone network was not possible within 2 minutes. You should check the aerial position. If that doesn't work, trigger a reset by briefly pressing the pushbutton for entering the PIN and make another attempt to dial in.