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Thanks @bernardgreen it all works flawlessly now!

Yeah, i just picked the symbol because it looks like valve and has two connections :) anyway, thanks for the help, i will rewire cables later.

Oh I seen now! So I need to change the wiring. Could you please double check if I applied it correctly for my case?

Sorry, maybe i didn't understand, but this is exactly how it is wired in my case. Only i use pin 1, as it is for NC valves (i tried 2 anyway, but it still doesn't work). The 4 (L) is live wire, testing screwdriver lights up when touching it.

Ok, but on the thermostat judging by the electrical connection, it is the N which is switched as you can see in attachment. Should i flip them anyway? Also I cannot change the colors of the cables, as they are in the wall already.

Here is a diagram of wiring. Thank you!

It’s rather complicated, i can try to make a wiring scheme. There are 5 thermostats in the house, but 3 of them are shorted together (first floor large room had 3 thermostats so it was not necessary). Old thermostats did work, but i changed wiring since then.

Hello, I bought 3 thermostats from Aliexpress, model BHT-002 GA as it should have fit underfloor water heating. The problem is, all 3 of them do not work. They work as if, the display is operative, but when the heating is on, it does not short contacts 1&3. I hear the relay clicking. I checked...