Temperature anomaly on BS18B20 + NodeMCU on Tingspeak
Have you checked the device's Scratchpad CRC


Idk how to.


  How is your device hooked up (diagram)


Device is hooked up in normal mode, right like in this pic


DS18b20 (waterproof) is located on top of the boiler in a special pit for measuring temperatures, there are definitely no any sort of microwaves here, and the temp is not higher than 80C.
I'll try today to change the power supply, just in case, and later switch the sensor into parasite mode.