Problem with regulating hot water in the shower (and only there) in the apartment

Hi,

I`m a layman, so maybe someone with knowledge will be able to help me:

Until today everything was fine until suddenly I noticed that in the shower my water regulation was limited only to the summer-cold water temperature range. There is no problem in the rest of the apartment, including the washbasin faucet in the bathroom.

I have the following shower faucet:

https://in360.pl/tres-flat-kompletny-zestaw-p..._FJvTChIDEzAaVtKcOl2yviX6Vy1JhbdJ3DHf8jkQ-Wqj pDO3ewaAptAEALw_wcB&gclsrc=aw.ds

My observations:
- the temperature control knob has a full range of motion,
- when I set the knob to hot water, the part next to the knob gets hot, but the water that comes out of the rain shower slightly changes the temperature from cold to lukewarm;

Any ideas or suggestions on what to do about it? The battery is 8 months old.

Thank you in advance for any help!

Maybe the old installation has become overgrown and there is a large disproportion in flow.
If you only turn on the heat, what is the effect?
If you wait, let`s say 3 minutes, something warmer?
Where does the hot water come from?

Hi, this is a new block (commissioned in October 2019). The faucet is thermostatic. No change as I wait longer.

Is the "headphone" OK?
Battery needs to be replaced/repaired.

Natahriel wrote:

Hi,
...The battery is 8 months old.
...

If you have proof of purchase (not necessarily a receipt), file a complaint with the seller (warranty).

Tommy82 wrote:

Where does the hot water come from?

This question from my colleague "Tommy82", seemingly trivial, may turn out to be important. Mixing water from the mains is different from that from a heater, especially a gas heater.

Hot water comes from MPEC. I wonder if some filters/strainers could be clogged (this would explain why the faucet heats up, but no hot water still comes out, but I`m completely new and don`t know anything about the construction of this type of equipment). On the other hand, if it was a trivial matter, it is better not to call the warranty service, because they will charge me for stupidity and say that the battery is functional, it just needed to be cleaned.

The mixing of water in the faucet itself also takes place according to different principles. It goes differently in this way:
https://in360.pl/tres-flat-bateria-natryskowa...na-z-zestawem-punktowego-kompletna-chrom.html
Or otherwise in this one:
https://in360.pl/tres-flat-bateria-natryskowa-natynkowa-z-zestawem-punktowych-chrom.html
battery. If you have a different faucet in the kitchen and washbasin and a different one in the shower, this may be the reason for the difference.

After all, he wrote:

Natahriel wrote:

...
Until today everything was fine until suddenly I noticed that in the shower my water regulation was limited only to the summer-cold water temperature range...

Obviously the battery is to blame. I would advertise. It may be clogged with mixed water, but as you can see from the description, it is not.