hightech

Hi, my UMO+ extruder works only if the hotend temp ist above the temperature for the print. Also i cant move the extruder in the move-axis menu, if the hotend temperature is higher then the set temperature. If the temperature of the hotend reaches the set temperatur, it works. During the print, the extruder stops always the temperature drops under the set temperature. Ideas? PS Extruder stops under 170°C.