Here is the fan mosfets

@Phaedrux I thought they looked fine

How hard are they to replace? As long as I know what I'm looking at I can resolder new ones in. Or pivot to a heater pin to use for the fan

@Phaedrux I'm moving the slider on he dashboard.

When I try M106 the fan remains off

Here is M115 response

M115
FIRMWARE_NAME: RepRapFirmware for Duet 2 WiFi/Ethernet FIRMWARE_VERSION: 3.2-beta3.2 ELECTRONICS: Duet WiFi 1.02 or later FIRMWARE_DATE: 2020-11-12

I also updated the fan parameter to include M106 P0 C"PartCoolingFan" S0 H-1 and still no response when setting the fan selection to 100%

Here is rest of Config.g

; Configuration file for Duet WiFi (firmware version 3)
; executed by the firmware on start-up
;
; generated by RepRapFirmware Configuration Tool v3.1.8 on Sun Nov 22 2020 22:50:11 GMT-0500 (Eastern Standard Time)

; General preferences
G90 ; send absolute coordinates...
M83 ; ...but relative extruder moves
M550 P"Workstation 1" ; set printer name
M669 K1 ; select CoreXY mode

; Drives
M569 P0 S1 ; physical drive 0 goes forwards
M569 P1 S1 ; physical drive 1 goes forwards
M569 P2 S0 ; physical drive 2 goes backwards
M569 P3 S1 ; physical drive 3 goes forwards
M584 X0 Y1 Z2 E3 ; set drive mapping
M350 X16 Y16 Z16 E16 I1 ; configure microstepping with interpolation
M92 X80.00 Y80.00 Z400.00 E420.00 ; set steps per mm
M566 X900.00 Y900.00 Z60.00 E120.00 ; set maximum instantaneous speed changes (mm/min)
M203 X6000.00 Y6000.00 Z180.00 E1200.00 ; set maximum speeds (mm/min)
M201 X500.00 Y500.00 Z20.00 E250.00 ; set accelerations (mm/s^2)
M906 X800 Y800 Z800 E800 I30 ; set motor currents (mA) and motor idle factor in per cent
M84 S30 ; Set idle timeout

; Axis Limits
M208 X-10 Y4 Z0 S1 ; set axis minima
M208 X330 Y330 Z400 S0 ; set axis maxima

; Endstops
M574 X1 S1 P"!xstop" ; configure active-high endstop for low end on X via pin xstop
M574 Y1 S1 P"!ystop" ; configure active-high endstop for low end on Y via pin ystop
M574 Z1 S2 ; configure Z-probe endstop for low end on Z

; Z-Probe
M950 S0 C"exp.heater3" ; create servo pin 0 for BLTouch
M558 P9 C"zprobe.in" H5 F120 T6000 ; set Z probe type to bltouch and the dive height + speeds
G31 P750 X-36.4 Y-4 Z2.73 ; set Z probe trigger value, offset and trigger height
M557 X60:270 Y60:270 S15 ; define mesh grid

; Heaters
M308 S0 P"bedtemp" Y"thermistor" T100000 B4138 ; configure sensor 0 as thermistor on pin bedtemp
M950 H0 C"bedheat" T0 ; create bed heater output on bedheat and map it to sensor 0
M307 H0 A121.5 C394.6 D1.5 V23.9 B0 S1.00 ;disable bang-bang mode for the bed heater and set PWM limit
M140 H0 ; map heated bed to heater 0
M143 H0 S100 ; set temperature limit for heater 0 to 100C
M308 S1 P"e0temp" Y"thermistor" T100000 B4138 ; configure sensor 1 as thermistor on pin e0temp
M950 H1 C"e0heat" T1 ; create nozzle heater output on e0heat and map it to sensor 1
M307 H1 A592.9 C189.8 D3.1 V23.9 B0 S1.00 ; disable bang-bang mode for heater and set PWM limit
M143 H1 S255 ; set temperature limit for heater 1 to 255C

; Fans
M950 F0 C"fan1" ; create fan 0 on pin fan1
M106 P0 C"PartCoolingFan" ; set fan 0 name and value. Thermostatic control is turned off
M950 F1 C"fan2" ; create fan 1 on pin fan2
M106 P1 C"Heatsink" S1 H1 T45 ; set fan 1 name and value. Thermostatic control is turned on

; Tools
M563 P0 S"Hotend" D0 H1 F0 ; 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

; Miscellaneous
M575 P1 S1 B57600 ; enable support for PanelDue

Hello I cannot for the life of me get my part cooling fan to work

Part Cooling fan is plugged into fan 1 and heatsink fan is plugged into fan 2. I shorted the mosfet on the board for fan 0 so I shifted everything down. When I plug the part cooling fan into the always on pins, spins up no trouble.

The heat sink fan works just fine. Turns on at 45C as expected.

; Fans
M950 F0 C"fan1" ; create fan 0 on pin fan1
M106 P0 C"PartCoolingFan" ; set fan 0 name and value. Thermostatic control is turned off
M950 F1 C"fan2" ; create fan 1 on pin fan2
M106 P1 C"Heatsink" S1 H1 T45 ; set fan 1 name and value. Thermostatic control is turned on

; Tools
M563 P0 S"Hotend" D0 H1 F0 ; 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

where are they at on the board. happy to replace them as long as i know what i am looking at

@dc42 tested continuity between the 3 non working fan outputs from the pins as well as from the back of the board and I come up with 0.2 Ohms.

I tried moving the jumper pin to 5V and putting a new 5v fan on but no luck there either.

@jens55 checked and replaced even just to be sure

forgot to add using 24 V fans. Also I measure across fan 0 V-fan and fan0- my multimeter reads 20V