Vicare DHW vitocal 060 hysteresis parameters

Hi,
I integrated with success my 2 devices DHW vitocal 060 and heating vitocal 150-A. I am living in France, units are in Celsius. I could convert all the temperatures from F to C. But the hysteresis parameters (on:7°C/off:0°C) are treated as T and are converted to -273 and 268°C!!!
How to fix that?
Thanks