I did turn out to be a hot end short causing the weird errors. Closed.

@phaedrux Thanks for the help. I've ordered a new Duet board, can't live without it

@phaedrux Thanks for the help. I've ordered a new Duet board, can't live without it

@phaedrux So the board is likely dead?

@dc42 Yes the main processor gets quite hot (probably 50c within 30 seconds) while the other components stay cool.

While fixing something my hotend, the parts cooling fan wires came loose and shorted somehow, I saw a small spark for a millisecond and afterwards the board was unresponsive and never connected to WiFi again.

I've tried following the guide here ("What to do if your Duet won't respond")

The DIAG light is constantly on, so is 3.3v, 5v and the light between reset and USB. I've not been able to reset or erase the firmware following the guide and the port doesn't show up on my MacBook (using SerialTools and Terminal).

I've completely disconnected the board from the 3D printer, checked the fuses and that the reset button isn't pressed in...

Is it dead? I read something about fixing a shorted fan somewhere on here?..

I did turn out to be a hot end short causing the weird errors. Closed.

@Phaedrux Uhm, do you mean phsyical screw terminal? In that case it is, and yes it is DC.

Apologies for dumb questions... Still learning

@Phaedrux Do you mean switching the "terminals" so E1 --> E0?

E0 (heated bed) works fine as far as I can tell although I had to do a PID autotune after the suspected short, and the bed is heating slower than I remember.

I caused a heater cartridge short (I believe), I accidentally worn the wire insulation to the hot end down by overtightning the assembly.

I replaced a blown 7.5a fuse, insulated the wires with electrical tape as an attempt to revive it.

Now I'm having thermister faults...

I changed the thermister as I thought that was the issue, but I'm getting VSSA faults on both the bed and hotend, after the bed has warmed up and while the hotend is warming up?

I read that a heater cartridge short can cause VSSA fault, so should I assume that I need to replace the heater cartridge?

@Phaedrux
This video shows what I mean:
https://youtu.be/Dt5jatG5b4M

My config is:

; Fans
M950 F0 C"fan0" Q500                               ; create fan 0 on pin fan0 and set its frequency
M106 P0 S0 H-1                                     ; set fan 0 value. Thermostatic control is turned off
M950 F1 C"fan1" Q500                               ; create fan 1 on pin fan1 and set its frequency
M106 P1 S1 H0:1 T45                                ; set fan 1 value. Thermostatic control is turned on
M950 F2 C"fan2" Q500                               ; create fan 2 on pin fan2 and set its frequency
M106 P2 S1 H-1                                     ; set fan 2 value. Thermostatic control is turned off
 
; Tools
M563 P0 S"tool" D0 H1 F0:2                         ; 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

@Phaedrux
Altough now when I manually adjust the levels of the tool fan (fan1) all the other fans follow the same level... The only one that I can change independently is fan2??