Viessmann D6 Error ~repack~

If the error persists after a reset, you likely have a hardware issue that requires a Gas Safe engineer . They will need to: circulation pump for electrical failure or mechanical blockage. between the pump and the control board. Verify the

While some initial checks can be performed by a homeowner, most D6 repairs require a Gas Safe registered engineer due to the involvement of the gas burner and internal electrical components. Viessmann Fault Code Checker viessmann d6 error