Heating, manufacturer of defective mixer

Hello dear forum members,

it seems that the mixing valve in my unit is defective, very stiff, so that the actuator can no longer move it.

can you help me, who the manufacturer is and where to buy something like this?

thank you.
Markus

I would say at the local heating engineer?

Well, I would just like to replace it myself and therefore purchase it online.
Best regards

Sometimes going to the local craftsman is perhaps the easier and cheaper way. The important thing is that the measurements fit, the manufacturer does not matter, if the thing is from Anodazumal, you will probably have to adjust everything anyway.