I’ll check to make sure this is not a regional issue (what region is your Windows set to?), but I have difficulty believing that your camera is reporting a proper temperature.
[18/04/2015 9:33:48] [DEBUG] [TEC Thread] TEC Change: Changing temp from 0,00 to -5,00 in 300 seconds...
Every time you tried to cool, your camera reported it was exactly at 0C. This seems like the camera TEC is not functioning (or reporting properly). I know most QHY cameras have a separate power supply for the TEC. Have you checked to make sure yours is still OK?