@Veti I´ve measured the resistance now. it starts with 5 MΩ on green, black and goes up to over 30MΩ.
the blue/red coil starts with 12MΩ and goes up to 20MΩ.

@Danal did it and nothing changed, except the motor is humming little bit louder. 1,5A is the limit for this motor I think. It´s a 42SHDC3025-24B

by the way, the board operated correctly all the time. A day before the first fault it printed correctly. At next day I powered it on, tried to home all. the x and y axis homed correctly and when it had to move to the middle of the heat bed nothing happened

@Danal so I´ve tested to override the homing. then sent g0 for x-axis. For positive values, the motor hasn´t moved and blocked immediately. With negative value, it moved once and then blocked, too.

@droftarts

@droftarts and here is my homeall.g

; homeall.g
; called to home all axes
;
; generated by RepRapFirmware Configuration Tool v2.1.2 on Sat Nov 23 2019 01:39:28 GMT+0100 (Mitteleuropäische Normalzeit)
G91 ; relative positioning
G1 H2 Z5 F6000 ; lift Z relative to current position
G1 H1 X-244 Y-215 F1800 ; move quickly to X and Y axis endstops and stop there (first pass)
G1 H2 X5 Y5 F6000 ; go back a few mm
G1 H1 X-10 Y-10 F360 ; move slowly to X and Y axis endstops once more (second pass)
G90
G1 H2 X100 Y100 F6000 ; go back
G30
;G1 H1 Z-265 F360 ; move Z down stopping at the endstop
;G90 ; absolute positioning
;G92 Z0 ; set Z to axis minimum (you may want to adjust this)

; Uncomment the following lines to lift Z after probing
;G91 ; relative positioning
;G1 S2 Z5 F100 ; lift Z relative to current position
;G90 ; absolute positioning

@droftarts Yes I know about the spelling, but it´s often used and so I didn´t try. And of course the importance of turning of the board, so I hope the stepper driver are intact...

here is my config:

; Configuration file for Duet WiFi (firmware version 2.03)
; executed by the firmware on start-up
;
; generated by RepRapFirmware Configuration Tool v2.1.2 on Sat Nov 23 2019 01:39:28 GMT+0100 (Mitteleuropäische Normalzeit)

; General preferences
G90 ; send absolute coordinates...
M83 ; ...but relative extruder moves
M550 P"Anet A8" ; set printer name

; Network
M552 S1 ; enable network
M586 P0 S1 ; enable HTTP
M586 P1 S0 ; disable FTP
M586 P2 S0 ; disable Telnet
M575 P1 B57600 S1 ; Set auxiliary serial port baud rate and require checksum (for PanelDue)

; Drives
M569 P0 S0 ; physical drive 0 goes backwards
M569 P1 S1 ; physical drive 1 goes forwards
M569 P2 S0 ; physical drive 2 goes backwards
M569 P3 S0 ; physical drive 3 goes backwards
M569 P4 S0 ; physical drive 4 goes backwards
M584 X0 Y4 Z2 E3 ; two Z motors connected to driver outputs Z
M671 X-85:295 Y0:0 S2 ; leadscrews at left (connected to Z) and right (connected to E1) of X axis
M350 X16 Y16 Z16 E16 I1 ; configure microstepping with interpolation
M92 X100.00 Y100.00 Z400.00 E99.5 ; set steps per mm
M566 X3000.00 Y3000.00 Z1000.00 E3000.00 ; set maximum instantaneous speed changes (mm/min)
M203 X3000.00 Y3000.00 Z1000.00 E3000.00 ; set maximum speeds (mm/min)
M201 X500.00 Y500.00 Z500.00 E500.00 ; set accelerations (mm/s^2)
M906 X700 Y900 Z700 E700 I30 ; set motor currents (mA) and motor idle factor in per cent
M84 S30 ; Set idle timeout

; Axis Limits
M208 X0 Y-5 Z0 S1 ; set axis minima
M208 X208 Y225 Z285 S0 ; set axis maxima

; Endstops
M574 X1 Y1 S0 ; set active low and disabled endstops
M574 Z1 S2 ; Set endstops controlled by probe (Z-endstop is Z-probe)

; Z-Probe
M558 P8 x0 y0 z1 I1 H2 R0.75 F150 T3000. ; Set Z probe type to switch and the dive height + speeds
G31 P250 X0 Y0 Z0 ; set threshold and offsets
M557 X0:200 Y0:200 S40 ; Define mesh grid

; Heaters
M307 H1 A450.6 C132.0 D5.5 V12.4 B0 ; disable bang-bang mode for the bed heater and set PWM limit
M305 P0 T100000 B4725 C7.060000e-8 R4700 ; set thermistor + ADC parameters for heater 0
M143 H0 S130 ; set temperature limit for heater 0 to 130C
M305 P1 T100000 B4725 C7.060000e-8 R4700 ; set thermistor + ADC parameters for heater 1
M143 H1 S275 ; set temperature limit for heater 1 to 275C

; Fans
M106 P0 T65:125 I0 H1:2 S0.75 C"Mitte" ; set fan 0 value, PWM signal inversion and frequency. Thermostatic control is turned on
M106 P1 S0 I0 F500 H-1 C"Rechts" ; set fan 1 value, PWM signal inversion and frequency. Thermostatic control is turned off
M106 P2 S0 I0 F500 H-1 C"Links" ; set fan 1 value, PWM signal inversion and frequency. Thermostatic control is turned off

; Tools
M563 P0 D0 H1 F1:2 ; define tool 0
G10 P0 X0 Y0 Z0 ; set tool 0 axis offsets
G10 P0 R0 S0 ; set initial tool 0 active and standby temperatures to 0C

; Custom settings are not defined
M501

; Miscellaneous
M375 ; load height map
T0 ; select first tool

Hello Guys. I'm new here and it's my first post.
my Duet 3d Wifi Controller board is still not working correctly or has an technical error since a few days.
When I try to home the z-axis, the z motors Lifts the Extruder as requested. But then the x and y motors have to move, but still don´t do.

I controlled the x Motor separatly via the homing command and it still worked. After that I moved it the other way round and it move one round and stuck. Neither I could move it via Software nor by Hand.

I´ve tried 3 motors connected to the plugs E1, X, Y and everytime I´ve got the same issue.

In my opinion the Controller board has got an technical error or do anyone has got a solution?