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As I suspected, the cables in the wall box are too close to tell apart with my non-contact tester. But looking at a ceiling light that's maybe 2m away, closest to the thermostat, brown has current and blue does not. I'm assuming here the electricians kept the color standard all over...

I actually have a non contact tester but the distance between the terminals is small enough that I'm not sure I get proper readings and no cross talk. And I'd rather not pull on the wires to distance them while energized. But I'll give it another try somehow. I have multiple Meross thermostats...

Ok, took forever and just as I was about to say "screw it, I buy a new multimeter", I found mine. So the measurements are as follows: Blue(N)-Black(L) 230V, Blue(N)-Brown(NC) 230V, Black(L)-Brown(NC) 0V. Between Blue(N) and NO (which is now not connected to any wire) I get ~4V. The way the...

I will dig for my multimeter through my moving boxes, I'll try to test the proper way and come back with results. I didn't try to create any different kind of loop to replicate the original wiring.

Still stumped. Switching between NO/NC made no difference. All the swapping I tried so far changed nothing, the thermostat comes up just fine, the actuator stay powered and open all the time. Any idea what I could measure to see if the wires are what they are expected to be for this thermostat...

The Meross booted up just fine when I wired Brown-L and Black-NO, as well as when I swapped and put Black-L and Brown-NO (as per the old wiring as opposed to the example Meross wiring). Tonight when I get home I'll move Brown from NO to NC and see if that solves it. Any measurement I could take...

It's mounted on the wall right now so until I open it I can use the official picture from the Meross page to show the wiring: First wiring attempt was exactly as above. Blue in N, Brown in L, Black in NO, and a bridge between L and COM. I also had the idea that I got it wrong and Black is in...

Hi all! I am trying to replace an old thermostat (Germany, underfloor heating, no boiler) where the casing chipped a bit with something a tad smarter and settled on the Meross MTS200. I'm stumped on the wiring though and reading all the other similar MTS200 threads didn't help me solve the...