Viessman Vitotronic 150 code d1

Hi Folks,

I have a Viessmann oil boiler model Vitotronic 150, it is located in the basement and is more than 5 years old (out of warranty). Oil has finished about 3 weeks ago and we had our tank refilled, happy that we are all covered for the winter. Unfortunately since then boiler shut downs displaying message d1? Anyone an idea what is wrong and how to fix it?

Best Regards


Hi Adam

When you are re-filling your tank you should let the sludge settle for a day or two- meaning not using the boiler during this time. I assume it didn’t happen here, right? So sludge from the bottom of the tank got stirred by the new oil and then got straight into the filter, that got stacked causing d1 error What I now see as a solution is simple filter exchange, less than an hour job, not much cost versus boiler specialist or the filter itself.