Dust, debris, or a mechanical fault can prevent the fan from reaching the required RPMs.
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:
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.
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