Ah, that changes everything. You are right - there must be a reason why the fuse was blown. May be the fan took too much current. In this case it´s possible, that parts of the electronic got damaged as well. Or another fuse inside the Vitodens is still blown. All the troubleshooting and replacements should now run under warranty. May be your Vitodens was a "monday device" and something was bad from the beginning. In this individual case you just can make sure that Viessmann changes the most likely components and hope that the bad one was one of them...
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