The current is 800 mA. I've removed all the cables it is still "temperature-warning standstill". And only both extruder chips will be very hot. Maybe both chips are damaged.

Hello

For 2 weeks my printer with Duet Wifi finished. And he really works very well. But since 4 days both extruder engines Drive 3 / Drive 4 (Nema 17HS08-1004S) work no longer. Connected to X Drive 0 and Y Drive 1 they work. They are also not heated or make noises. The chips have no damage on the surface. All cables were reconnected with plugs.
The diagnosis is "temperature-warning standstill". What can it mean?
Strangely, it was only printed with Drive 4. The printer is operated with 24V. Where is the error?
Greetings from Hamburg

=== Diagnostics ===
Used output buffers: 1 of 32 (9 max)
=== Platform ===
Static ram used: 20320
Dynamic ram used: 73104
Recycled dynamic ram: 784
Stack ram used: 968 current, 3168 maximum
Never used ram: 33696
Last reset 00:46:29 ago, cause: power up
Last software reset code 0x0003, HFSR 0x00000000, CFSR 0x00000000, ICSR 0x00400000, BFAR 0xe000ed38, SP 0xffffffff
Spinning module during software reset: GCodes, available RAM 33576 bytes (slot 0)
Error status: 0
Free file entries: 10
SD card 0 detected, interface speed: 20.0MBytes/sec
SD card longest block write time: 0.0ms
MCU temperature: min 44.9, current 50.9, max 54.4
Supply voltage: min 23.8, current 24.0, max 24.2, under voltage events: 0, over voltage events: 0
Driver 0: stalled standstill
Driver 1: stalled standstill
Driver 2: stalled standstill
Driver 3: temperature-warning standstill
Driver 4: temperature-warning standstill
Date/time: 2017-09-24 22:21:04
Slowest main loop (seconds): 0.009888; fastest: 0.000000
=== Move ===
MaxReps: 0, StepErrors: 0, MaxWait: 0ms, Underruns: 0, 0
Scheduled moves: 20, completed moves: 20
Bed compensation in use: none
Bed probe heights: 0.000 0.000 0.000 0.000 0.000
Probe change coordinates:
=== Heat ===
Bed heater = -1, chamber heater = -1