Problem with the DS18B20 temperature sensor (NUCLEO-F401RE board )

Hi,
please find here the results for my Nucleo F401RE C0-2;

1) Clock accuracy:

 _____                 _
|   __|___ ___ ___ _ _|_|___ ___
|   __|_ -| . |  _| | | |   | . |
|_____|___|  _|_| |___|_|_|_|___|
          |_| http://espruino.com
 1v93 Copyright 2016 G.Williams
Espruino is Open Source. Our work is supported
only by sales of official boards and donations:
http://espruino.com/Donate
>
=undefined
>displayResults()
31.64555874999 10.21179736904
41.81299369047 10.16743494047
51.65689622619 9.84390253571
61.63007591666 9.97317969047
71.57576703571 9.94569111904
81.62324639285 10.04747935714
91.60931855952 9.98607216666
101.71581107142 10.10649251190
111.63114655952 9.91533548809
121.65549364285 10.02434708333
average of  11  x-second measurements:  0.91130428030
=undefined
>

The average value of measurements is close to 10 s (the clock\Timer accuracy seems OK)

2) DS18B20 "cabled sensor" issue
Unfortunately I have the same result of previous board (please see below)...

 _____                 _
|   __|___ ___ ___ _ _|_|___ ___
|   __|_ -| . |  _| | | |   | . |
|_____|___|  _|_| |___|_|_|_|___|
          |_| http://espruino.com
 1v93 Copyright 2016 G.Williams
Espruino is Open Source. Our work is supported
only by sales of official boards and donations:
http://espruino.com/Donate
>
=undefined
Temp is null°C
Temp is null°C
Temp is null°C
Temp is null°C

Regards