ᐅ Adjusting Underfloor Heating – Is It Malfunctioning?

Hello everyone,

We recently renovated the bathroom on our upper floor. The underfloor heating was working when we finished.
However, it now seems to have stopped working.
Unfortunately, I have no idea what settings I should adjust.
Does anyone have an idea if everything is properly regulated here?
Apparently, the right connection is not functioning.

Maybe the actuator is faulty. Maybe try removing it and using it on/from another circuit.

I can’t manage this on my own.
Can I deduce anything from the pictures or the fill levels marked in red?
Otherwise, I don’t see any difference between the individual outgoing manifolds.

What happens if you press on this ribbed tab (on both sides) and then twist or pull it? The part with the Zewotherm label must be removed in the bathroom before you can continue inspecting.

Haha, that’s my idea too. I’m just afraid of doing it and causing some damage. If you tell me I can try it with peace of mind, I will go ahead and do it.

To me, it looks like someone has screwed in the sight glass from the bathroom. It seems to sit deeper than the others, doesn’t it?!