@dc42 thank you I got it working. For those who might come later in this post here is my config for reference :
M584 X0.0 Y0.1 Z0.2 A0.3 C0.4 E0.5 U1.0 ; set drive mapping
M669 K0 X1:0:0:0:0:0 Y0:1:0:0:0:0 Z0:0:1:0:0:0 ; set kinematics parameters
M669 K0 U0:0:0:1:0:0 A0:0:0:0:1:0 C0:0:0:0:-1:1 ; set kinematics parameters
@jay_s_uk I had success with your proposition, thank you !
This config let us reproduce the problem :
; Duet 3 Configuration File
G21 ; Work in millimetres
G90 ; Send absolute coordinates...
M83 ; ...but relative extruder moves
M669 K1 ; Set Core XY mode
;Bed
M308 S0 P"0.temp0" Y"thermistor" A"Bed" T100000 B4725 C7.06e-8 ; configure sensor 0 as thermistor on pin temp0
M950 H0 C"0.out0" T0 Q10 ; create bed heater output on out0 and map it to sensor 0
M307 H0 R0.605 K0.237:0.000 D2.36 E1.35 S1.00 B0 ; enable PID mode for the bed heater and set PWM limit
M140 H0 ; map heated bed to heater 0
M143 H0 S215 ; set temperature limit for heater 0 to 215C
;Chamber
M308 S5 P"1.temp0" Y"pt1000" A"Chamber" T100000 B4725 C7.06e-8 ; Set thermistor
M950 H5 C"1.out2" T5 ; Chamber heater
M950 P17 C"1.out3" ; Chamber heater fan
M307 H5 B0 S1.00 ; Bang bang tuning
M141 H5 ; Define heated chamber
M143 H5 S75 ; Set temperature limit for heater 5 to 70C
M570 H5 P999999 T50 ; configure heater fault on H4
To test this I did :