No,
sorry, but what's that for?
Doest it read the whole config at power on?
What should be inside the config-overwrite.g file?

So then it could be, that I have a defective sensor? When I deploy the probe with M401 it is dark (red switches off, no blue).

Hi fcwilt. thanks for your reply. After I had the first crash, I of course tested it the save way. Can you post your config and probe files?
I also tested it without the Touch SW Mode - same negative result.
Becomes your sensor blue if it triggers? Mine is only red...

Hello,
I have a Duet 2 Wifi Bord running firmware version V2.04RC4. Attached to that board there was a BLTouch V1.0, which worked perfectly.
Due to a mechanical defect on this sensor, I had to replace it.

Now I have a BLTouch V3.1 Sensor, but it doesn’t work correctly any more. On power on, the sensor makes the self-test and I am able to deploy and retract the probe correctly.
But when I try to home, the pin touches the bed , but the board doesn’t recognise it. So that the nozzle crashes into the bed. There appears no blue light…

What do I have to change to get this V3.1 sensor to run?

Here is my setup:
config.g:
; Endstops
M574 X1 Y1 S1 ; set active high endstops
M574 Z1 S2 ; set endstops controlled by probe

; Z-Probe
M307 H7 A-1 C-1 D-1 ; disable heater on PWM channel for BLTouch
M558 P9 H5 F120 T6000 ; set Z probe type to bltouch and the dive height + speeds
G31 P600 X49 Y0 Z2.5 ; set Z probe trigger value, offset and trigger height
M557 X50:450 Y50:450 S200 ; define mesh grid

deployprobe.g:
M280 P7 S10 I1; deploy BLTouch
G4 P100 ; Pause 100ms
M280 P7 S60 I1; Touch SW Mode
G4 P100 ; Pause 100ms

retractprobe.g:
M280 P7 S90 I1; retract BLTouch

homez.g:
G91 ; relative positioning
G1 H2 Z5 F6000 ; lift Z relative to current position
G90 ; absolute positioning
G1 H2 X210 Y250 F6000 ; go to first probe point
G30 ; home Z by probing the bed
G91 ; relative positioning
G1 H2 Z5 F100 ; lift Z relative to current position
G90 ; absolute positioning

Thank you for your help.