Reset the boiler
Sometimes the fault is a temporary logic glitch. viessmann d6 error
Viessmann systems use a digital address system (often via DIP switches) so the boiler knows which device is talking to it. Reset the boiler Sometimes the fault is a
Over time, vibration from the boiler pump and expansion/contraction of components can loosen the multi-pin connector between the control board and the display. Moisture ingress (leaks) can also cause green corrosion on terminals. viessmann d6 error
Debris in the system filter can restrict water movement.