Viessmann · Vitodens 200 Boilers
The user is unable to change the date setting on the boiler's control, which typically indicates a specific coding address needs adjustment.
Click steps to track your progress.
Refer to coding address OC7 in the manual for instructions on changing the date.
Adjust the OC7 coding as needed to set the correct date.
Power cycle the boiler (power ON/OFF) for the date changes to take effect.