This code typically signifies a flow rate error (often labeled as "contrôleur débit" or flow controller fault). It indicates that the system is not detecting sufficient water circulation to operate safely.
UK prices similar in GBP; always verify with a local engineer. viessmann d6 error
Viessmann boilers contain live electrical components and gas. If you are not comfortable or qualified, stop and call a Gas Safe (UK) or licensed HVAC technician. This code typically signifies a flow rate error
Viessmann D6 error (sometimes shown as typically indicates a communication or input fault related to the internal circulation pump DE1 digital input on the boiler's control board 🛠️ What Does D6 Mean? viessmann d6 error
If you have a multi-meter and technical skill: