Thermistor's shows 2000°C ( Slolved )



  • So I recently bought a duet wifi. I've conected it all and it's working, except for the heating.
    When I start my duet it's all normal.(except for the 2000°C)
    But when I try to heat up my Nozzel / Bed it goes to active and then fault,
    it also shows an error message.
    Error: Temperature reading fault on heater 1: unknown temperature sensor channel
    4988345e-4950-4ef0-acc6-e437c44cfd46-image.png

    I've seen some posts tackling this but none of them are helping me, or im just a dummy.
    I've mesured the thermistors at the conector they both show 100k.
    I've mesured the vssa fuse, endstop ground to thermistor vssa 0.6 Ohm.
    and I've checked the config file but I can't find anything wrong.

    My hotend heater/thermistor are conected on E0 heat / E0 temp
    and the bed to bed heat / bed temp.

    (I did notice that my bed thermistor wire had a bit exposed wire on it, but should I get 0.6 ohm
    if it had blown the vssa fuse ?)

    What can I do ? 😞

    config file below

    ; Configuration file for Duet WiFi (firmware version 3)
    ; executed by the firmware on start-up
    ;
    ; generated by RepRapFirmware Configuration Tool v3.1.3 on Mon Jun 15 2020 19:23:57 GMT+0200 (centraleuropeisk sommartid)

    ; General preferences
    G90 ; send absolute coordinates...
    M83 ; ...but relative extruder moves
    M550 P"JgAurora A5s" ; set printer name

    ; Network
    M552 S1 ; enable network
    M586 P0 S1 ; enable HTTP
    M586 P1 S0 ; disable FTP
    M586 P2 S0 ; disable Telnet

    ; Drives
    M569 P0 S1 ; physical drive 0 goes forwards
    M569 P1 S0 ; physical drive 1 goes backwards
    M569 P2 S0 ; physical drive 2 goes backwards
    M569 P3 S1 ; physical drive 3 goes forwards
    M584 X0 Y1 Z2 E3 ; set drive mapping
    M350 X16 Y16 Z16 E16 I1 ; configure microstepping with interpolation
    M92 X80.00 Y80.00 Z1066.67 E409.00 ; set steps per mm
    M566 X1200.00 Y1200.00 Z120.00 E600.00 ; set maximum instantaneous speed changes (mm/min)
    M203 X180000.00 Y180000.00 Z180.00 E7200.00 ; set maximum speeds (mm/min)
    M201 X1000.00 Y1000.00 Z50.00 E250.00 ; set accelerations (mm/s^2)
    M906 X1200 Y1200 Z1200 E800 I30 ; set motor currents (mA) and motor idle factor in per cent
    M84 S30 ; Set idle timeout

    ; Axis Limits
    M208 X0 Y0 Z0 S1 ; set axis minima
    M208 X265 Y280 Z300 S0 ; set axis maxima

    ; Endstops
    M574 X1 S0 P"xstop" ; configure active-high endstop for low end on X via pin xstop
    M574 Y1 S0 P"ystop" ; configure active-high endstop for low end on Y via pin ystop
    M574 Z1 S0 P"zstop" ; configure active-high endstop for low end on Z via pin zstop

    ; Z-Probe
    M558 P0 H5 F120 T6000 ; disable Z probe but set dive height, probe speed and travel speed
    M557 X15:215 Y15:195 S20 ; define mesh grid

    ; Heaters
    M308 S0 P"bedtemp" Y"thermistor" T100000 B4092 ; configure sensor 0 as thermistor on pin bedtemp
    M950 H0 C"bedheat" T0 ; create bed heater output on bedheat 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"e0temp" Y"thermistor" T100000 B4725 C7.06e-8 ; configure sensor 1 as thermistor on pin e0temp
    M950 H1 C"e0heat" T1 ; create nozzle heater output on e0heat and map it to sensor 1
    M307 H1 B0 S1.00 ; disable bang-bang mode for heater and set PWM limit

    ; Fans
    M950 F0 C"fan0" Q1000 ; create fan 0 on pin fan0 and set its frequency
    M106 P0 C"Cooling Fan 1" S0 H-1 ; set fan 0 name and value. Thermostatic control is turned off
    M950 F1 C"fan1" Q1000 ; create fan 1 on pin fan1 and set its frequency
    M106 P1 S1 H-1 ; set fan 1 value. Thermostatic control is turned off

    ; Tools
    M563 P0 S"Hemera" D0 H1 F0 ; define tool 0
    G10 P0 X0 Y0 Z0 ; set tool 0 axis offsets
    G10 P0 R0 S0 ; set initial tool 0 active and standby temperatures to 0C

    ; Custom settings are not defined

    ; Miscellaneous


  • Moderator

    Please verify what firmware version you have installed using M115 in the gcode console.

    Also send M98 Pconfig.g and report back with any errors.



  • Phaedrux is far more competent but I try to be helpful.
    The bed Heater section seems fine,
    In most cases I have seen here in this forum (if the thermistor is good), the principal culprit is bad wiring. Me too I experienced this and was bad wiring. If you just detach the nozzle thermistor you can see 2000 there also. If you plug it back , it turn normal.
    I would try a cross test. You need a different thermistor for the bed to try.
    Maybe you could use the nozzle thermistor on the bed channel for see if wiring are ok (of course without heat anything!). Numbers will be wrong but at least you know if there is a stable connection.



  • The M115 response:
    FIRMWARE_NAME: RepRapFirmware for Duet 2 WiFi/Ethernet FIRMWARE_VERSION: 2.03 ELECTRONICS: Duet WiFi 1.02 or later FIRMWARE_DATE: 2019-06-13b2

    and the M98:
    M98 PCONFIG.G
    HTTP is enabled on port 80
    FTP is disabled
    TELNET is disabled
    Warning: M308 command is not supported
    Warning: M950 command is not supported
    Warning: M308 command is not supported
    Warning: M950 command is not supported
    Warning: M950 command is not supported
    Warning: M950 command is not supported



  • @thomasthetrain That'll be it then. You are using version 2 firmware but your configuration file is for version 3 firmware. You need to change one or the other. If you are new to Duet, then the easiest path might be to use the online configuration tool to generate new configuration files but select the correct tool.



  • @giostark I have tryed to conect 100K resistors directly to the thermistor conector
    on on my duet and it behaves exactly the same



  • @thomasthetrain See my post above. When you use the configuration tool, under "Firmware version" there is a drop down list. Select "2.03 to 2.05" in that list.



  • This post is deleted!


  • Ok Thomas.
    Deck is right , you are using the v2 firmware with v3 settings.
    For upgrade the firmware from 2 to 3 you have to make before 2.xx.x>3.0 then 3.0>3.1.1
    If you have the panel due don't forghet to add this line on top :
    M575 P1 S1 B57600; enable panel due to connect properly
    Here all the info:
    https://duet3d.dozuki.com/Wiki/RepRapFirmware_3_overview#Section_Summary_of_what_you_need_to_do_to_convert_your_configuration_and_other_files

    ps:
    damn ctrl+shift+enter had tripled the post...



  • This post is deleted!


  • THANX everybody its all good now ❤


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