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Loose or corroded cables between the fan and the main control board (PCB) can disrupt signals.
On systems using Vitotronic 200 controls, D6 specifically points to a flow switch issue, indicating that the minimum required flow rate has not been reached. viessmann d6 error
If the fan and flow switch are working correctly, the control board itself may be misinterpreting data. Troubleshooting and Solutions Loose or corroded cables between the fan and
It often signifies that the fan speed is too high or too low at startup, preventing the ignition sequence from beginning safely. Troubleshooting and Solutions It often signifies that the
A stuck pump, airlock, or blocked filter can cause the flow switch to trigger a D6 error because water isn't moving through the heat exchanger fast enough.
In some configurations, it may indicate a fault at the DE1 connection on the external safety device adapter. Common Causes of a D6 Fault Several underlying issues can trigger this lockout: