打印机装好通电后挤出头风扇正常，任务m119，g28，m114都正常
但是pronterface中温度无法检测，lcd面板显示Err:MINTEMP,发送M999任务回馈：
SENDING:M999
Resend: 1
Error:0
[ERROR] Error:0
: Extruder switched off. MINTEMP triggered !
Error:Printer stopped due to errors. Fix the error and use M999 to restart. (Temperature is reset. Set it after restarting)
[ERROR] Error:Printer stopped due to errors. Fix the error and use M999 to restart. (Temperature is reset. Set it after restarting)
检查挤出机任务M302,并Extrude后回馈
Extruding 5.000000mm of filament.
Printer stopped due to errors. Fix the error and use M999 to restart. (Temperature is reset. Set it after restarting)
请问各位大神这里存在什么问题，是挤出机插得问题吗，附上挤出机的插线图