Heater defaults to on

AW23

Hi all. First time using and setting up a duet board, so this will probably be user error! I'm using a Mini5+ on an AM8. I have used the config tool to make a config file and have uploaded to the duet following the setup guides, but heater 1 seems to default to on (on the UI at least). I have only powered by USB so far, so main power hasn't yet been applied to the board. I have heater 1 set up as the hot end heater, and its plugged into Temp 1 on the board itself. The heater is 2A so I have wired directly to the Duet without an external relay etc.

from config.g

; Heaters
M308 S0 P"temp0" Y"thermistor" T100000 B4725 C7.06e-8 ; configure sensor 0 as thermistor on pin temp0
M950 H0 C"out0" 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 S70 ; set temperature limit for heater 0 to 70C
M308 S1 P"temp1" Y"pt1000" ; configure sensor 1 as PT1000 on pin temp1
M950 H1 C"out1" 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 S230 ; set temperature limit for heater 1 to 230C

I have tried M950 H1 C"!out1" T1 ; create nozzle heater, but it has made no difference after a reboot etc.

I have had a look through the forum and documentation but can't find a fix.

Any help would be greatly appreciated, thank you

jay_s_uk

@AW23 how do you know the heater is defaulting to on? would be good if you supplied a screenshot showing the issue you're seeing

droftarts

@AW23 Please post your full config.g, and type M115 into the console and post the response.

The heater can be 'active' after running config.g, especially if you activate a tool in config.g (ie you have T0 at the end) but so long as the active and standby temperatures are not set, it shouldn't heat. If you prefer to not have this behaviour, remove the T0 from config.g.

Ian

AW23

@droftarts @jay_s_uk

Thank you both for your quick replies. I have had a look at it and I think I had misunderstood how it works with regard to being active/off and then selecting temperatures to actually make it start to heat the hot end. I have played around with the config file and it works as you describe by commenting out the T0. I initially thought you were talking about in the heater definitions, but I found it at the end of the config file.

Thank you for your help