@Richard-F said in i have no idea:
; Nozzle
M950 H0 C"20.out0" T0 ; create heater #0 for the nozzle
M140 P0 H0
M143 H0 P0 T0 C300 S0 A0 ; configure nozzle heater monitor; Heaters BED
M950 H1 C"out0" T1 ; create heater #1 for the bed
M140 P1 H1 ; assign bed heater to heater 1
M143 H1 P1 T1 C100 S0 A0 ; configure bed heater monitor
You have defined both the 'Nozzle' and the 'Heaters BED' as bed heaters with M140. Remove the M140 P0 H0 in the Nozzle configuration.
Ian