Sorry found it the board needs S2 on the Z axis commands, what does S2 do?

New board fixed the issue but I have swapped from a V1.02 to the latest board and now my homing won't work, I get the error. Does it on all 3 axis.

G28 X

Error: G0/G1: insufficient axes homed

So what has changed

; Endstops
M574 X1 Y1 Z1 S1 ; Set active high endstops
M558 P0 X0 Y0 Z0 H5 F120 T6000 ; Set Z probe type to switch, the axes for which it is used and the dive height + speeds
G31 P600 X0 Y0 Z0.1 ; Set Z probe trigger value, offset and trigger height
M557 X15:485 Y15:485 S20 ; Define mesh grid

; homex.g
; called to home the X axis
;
; generated by RepRapFirmware Configuration Tool on Sat Dec 09 2017 11:28:54 GMT+0000 (GMT Standard Time)
G91 ; relative positioning
G1 Z5 F6000 ; lift Z relative to current position
G1 S1 X-505 F1800 ; move quickly to X axis endstop and stop there (first pass)
G1 X5 F6000 ; go back a few mm
G1 S1 X-505 F360 ; move slowly to X axis endstop once more (second pass)
G1 Z-5 F6000 ; lower Z again
G90 ; absolute positioning

so

; Tools
M563 P0 D0 H1 ; Define tool 0

becomes

; Tools
M563 P1 D0 H1 ; Define tool 0

and how do I change the fans?

; Fans
M106 P0 S0.1 I0 F500 H-1 ; Set fan 0 value, PWM signal inversion and frequency. Thermostatic control is turned off
M106 P1 S1 I0 F500 H1 T45 ; Set fan 1 value, PWM signal inversion and frequency. Thermostatic control is turned on
M106 P2 S1 I0 F500 H1 T45 ; Set fan 2 value, PWM signal inversion and frequency. Thermostatic control is turned on

As I have two other not always on fan connections can I just change the firmware to use another one?

No, it was working fine, turned it off restarted it next day and no fan. The fan is noisy but it does work.

Maplin DC 12V 0.10A 40mm Fan

Fan one has stopped working it reads as 13.5V but will not power a fan. The always on fans work and I have tried connecting the cooling fan to them and that works. So it appears I am having a problem with the board.

The cooling circuit had been working fine as the fan had been cutting in but now appears to be dead.

Any idea where to look next?

Just noticed the settings on my other machine are

M305 P1 T100000 B4725 C7.060000e-8 R4700

With the same setup.

So my config lists

M305 P1 T100000 B4725 C0 R4700

so is that correct based on a genuine V6?

Sorry new to firmware and don't understand the C parameter.

Can you add me to the list I have a print farm that i am converting over to duet's and filament monitoring is a must. Happy at the moment if it just detects a jam or filament out.