Niko Home Control II - I cannot calibrate my Digital black thermostat to -1.0 °C. When I save this value, the Niko Home app shows 21.5 °C
The Niko Home app shows the wrong calibration value (21.5 °C), but the Digital Black does not apply this calibration. This is a known issue that will be fixed soon.
At the moment you can avoid the problem by setting the calibration to -1,1 °C.