Why does the DS1820 sensor show the wrong temperature?

Question

Arduino

DS1820 - connected according to the "stray" scheme (2 wires). Works normally up to -15 degrees C.
When the temperature is (-15C), it starts to show +85C.
What could be the problem ?

Answer 1

I don’t remember exactly what value, but when the library cannot parse the value from 1-wire, it returns some constant number. Perhaps it is 85, and in this case you have communication problems.

Answer 2

First of all, check the health of your sensor.
By the way, the datasheet about "+85°C" says: The power-on reset value of the temperature register is +85°C .
If there is an Arduino board, connect it to it, upload the sketch from the examples, and test the operation of your temperature sensor by connecting it to the board.
After that, it will be clearer where and what to look for to solve the problem.
By the way, why don't you contact technical support for your device " Heat energy regulator MR-01 "?