Viessmann D6 Error [BEST]

The error reads as a "Flow Switch D6" or "Strömungssensor" fault . This means the internal flow rate has dropped below the minimum threshold required to safely operate the compressor or electric booster heaters.

What does the read right now?

Temporary electrical glitches can sometimes trick the EA1 module into sending a fault. Locate the external boiler disconnect switch or breaker. Turn the power completely off for at least 60 seconds. viessmann d6 error