My answer is for sure beyond the scope, but check cables on 1wire bus, check supply to the sensor, and check for the pull-up resistor.
BTW you could have DS18B20 hardwired to ESP8266, and if the ESP disconnects from WIFI you have unresponsive sensor.
...closing the OT.

This could be a good solution, I’ll have to do some work on electrical side, but your solution is what I would like to do. Can you please post some link to the stuffs you used (mainly the electrical valves)? I’d like to put valves at the distribution point, instead of at the radiator, so to avoid use ...

Hi all,
I'm looking for a radiator valve. I'll take at least three.
My choice is between Danfoss LC-13 and Fibaro FGT-001 ZW5.
Any advice?
Thanks.

Ciao emme, I'd like not to add hardware other than the valves themselves. Moreover my house is well covered with Wi-Fi. Actually I have a RasPI model B rev. 2, a bunch of DS18B20, one BME280, one ESP 8266 and I'm going to receive a ESP32. So maybe some Bluetooth product can help. But I don't know if ...

Thank you emme. Talking about Netatmo (it seem Fibaro has only Z-Wave products, at least in Italy) I assume these valves can be managed in LAN, not only by their own cloud. If this is the case, it should be enough to set IP addres without gateway. I case I want to manage them from outside the house ...

Hello everyone,
are you aware of valve for radiators that can be controlled via TCP/IP (Wi-Fi), rather than z-Wave?
This is because I'd like to avoid the addition of Z-wave controller in my network.

Thanks
Squalo