3.3RC1+2 heater tuning problem

[MartinNYHC]

When trying to tune the hotend heater with

M303 H1 S240 A58

tuning is starting with phase2 and after switching to phase 3 temperature is jumping to 400°C and more.

I'm using a Duet Mini 5 with SBC and 3.3RC1+2 you provided me last week due to the SBC connection problems.

; Heaters
M308 S0 P"temp0" Y"thermistor" T100000 B4092       		; configure sensor 0 as PT1000 on pin temp0
M950 H0 C"out1" T0                      				; create bed heater output on out0 and map it to sensor 0
M307 H0 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 S120                            				; set temperature limit for heater 0 to 120C
M308 S1 P"temp1" Y"thermistor" T100000 B3950        	; configure sensor 1 as PT1000 on pin temp1
M950 H1 C"out2" T1                      				; create nozzle heater output on out1 and map it to sensor 1
M307 H1 B0 S1.00                        				; disable bang-bang mode for heater  and set PWM limit
M143 H1 S300                            				; set temperature limit for heater 1
M308 S2 P"temp2" A"Chamber" Y"thermistor" T100000 B3950

[MartinNYHC]

Same behaviour without A parameter.

[dc42]

@martinnyhc do you mean the displayed temperature jumps suddenly to 400C when it enters phase 3? Or increases gradually to 400C, as if it is heating up?

[MartinNYHC]

It looks like my brand new Thermistor was faulty. Replaced it and now it looks good.

Sorry for that!

[dc42]

No problem! Glad you solved it.