Guntamatic pellet heating: Flow temperature too high

Hello everyone,
apparently my pellet heating system is incorrectly set. I have already tried and checked quite a bit but cannot explain it. The flow temperature rises above 50 degrees. I'm already afraid that my tiles will crack ;) (underfloor heating)

It is a Guntamatic with 10kW.

What I have already looked at:
- Mode is Eco-Ideal. Should be the right one
- Operating mode Normal
- For testing, set target temperature to 18 degrees. Did not improve in terms of a lower flow temperature
- Heating curve adjusted from 0.6 to 0.5 (0.6 should be fine)
- Screed heating is of course off
- Flow max is at 37 degrees. So it should never get that hot...

Attached are a few pictures:

Hi

The boiler operates on a buffer? from the buffer out then with a mixer and mixer motor?
Does the mixer operate correctly or possibly in manual mode?


Olli

Hello Oli. Yes, I have a mixer, at least it was still working yesterday.

In the picture you can see the mixer. It is set to the lowest level. Does that mean it mixes in little heat??? Or a lot?

I find your other questions difficult as a layman, but I’ll try to explain. You’ll understand what I mean ;)

The pellet heating system warms the large buffer tank that is responsible for the domestic hot water. The pipe for the underfloor heating goes through this buffer ;) what do you mean by boiler? The large buffer tank, of course.

I don’t have a buffer tank for the underfloor heating (to the best of my (layman’s) knowledge)

Hello So as the mixing motor is positioned, almost exclusively water from the return flow should flow into the supply flow. First, it must be checked whether the mixing motor is properly mounted on the mixer. You can also press the round button once and then turn it all the way to the right. Does the supply temperature then decrease? Olli

So the mixer doesn't move. I opened it up earlier and noticed that the screw holding the "button" is loose. I just read that you also have to press in order to adjust manually. I'll try again later.

So apparently it wants to take the water from the return flow (so to decrease) but can't. Maybe because the component isn't seated properly.

I'll take another look at it later. I currently live about half an hour away...

Should the red ring be visible when the system is regulating? Or should I push it in?