What the manual says
Manufacturer manualParameters have been restored
From this model's manual
Verified against the Viessmann Vitodens 200 W B2hf System installation & service manual.
DIY fix possible
Check the display for any other flashing red symbols or codes.Verify that your heating and hot water are still operating at your preferred temperatures.Press the 'OK' or 'Menu' button to acknowledge and clear the notification from the screen.
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