Error - Viessmann D6

Several issues along the airflow and electrical path can trigger a D6 error:

No. Aside from checking the external flue pipe for blockages or attempting a basic system reset, all internal diagnostics require opening the combustion chamber. In most jurisdictions, it is illegal and highly dangerous for anyone other than a licensed, certified gas professional to service internal boiler components. Is it safe to keep running the boiler with a D6 code? viessmann d6 error

The fan motor may have burned out, or the bearings might be seized, preventing the blades from spinning. Several issues along the airflow and electrical path

However, there are two things you can try before calling the pros: Is it safe to keep running the boiler with a D6 code

The most common cause of a D6 error is accidental overpressurization. If you recently topped up your boiler using the filling loop, you may have added too much water. A healthy system should sit between 1.0 and 1.5 bar when cold. 2. A Failing or Open Filling Loop

When a Gas Safe registered engineer arrives, they will likely take the following steps: