Bed Temperature ERROR



  • My bed temp reads ERROR on the WebControl page and -273.1 on the display. I checked thermistor resistance values of both sensors at the board both read about 117k. The bed and hotend are chinese junk for now. Here is my config file:

    ; Configuration file for Duet WiFi (firmware version 1.17)
    ; executed by the firmware on start-up
    ;
    ; generated by RepRapFirmware Configuration Tool on Wed May 03 2017 10:36:50 GMT-0400 (Eastern Daylight Time)

    ; General preferences
    M111 S0 ; Debugging off
    G21 ; Work in millimetres
    G90 ; Send absolute coordinates…
    M83 ; ...but relative extruder moves
    M555 P2 ; Set firmware compatibility to look like Marlin
    M208 X0 Y34 Z0 S1 ; Set axis minima
    M208 X200 Y200 Z180 S0 ; Set axis maxima

    ; Endstops
    M574 Z0 S0 ; Define active low and unused microswitches
    M574 X1 Y1 S1 ; Define active high microswitches
    M558 P1 X0 Y0 Z1 H5 F120 T6000 ; Set Z probe type to unmodulated, the axes for which it is used and the probe + travel speeds
    G31 P443 X0 Y0 Z1.5 ; Set Z probe trigger value, offset and trigger height
    M557 X30:185 Y15:185 S20 ; Define mesh grid

    ; Drives
    M569 P0 S0 ; Drive 0 goes backwards
    M569 P1 S0 ; Drive 1 goes backwards
    M569 P2 S1 ; Drive 2 goes forwards
    M569 P3 S1 ; Drive 3 goes forwards
    M350 X32 Y32 Z32 E32 I1 ; Configure microstepping with interpolation
    M92 X320 Y320 Z10240 E420 ; Set steps per mm
    M566 X900 Y900 Z50 E120 ; Set maximum instantaneous speed changes (mm/min)
    M203 X6000 Y6000 Z100 E1200 ; Set maximum speeds (mm/min)
    M201 X500 Y500 Z25 E250 ; Set accelerations (mm/s^2)
    M906 X800 Y800 Z800 E800 I30 ; Set motor currents (mA) and motor idle factor in per cent
    M84 S30 ; Set idle timeout

    ; Heaters
    M143 S260 ; Set maximum heater temperature to 260C
    M305 P0 T100000 B3950 C0 R4700 ; Set thermistor + ADC parameters for heater 0
    M305 P1 T100000 B3950 C0 R4700 ; Set thermistor + ADC parameters for heater 1

    ; Tools
    M563 P0 D0 H1 ; 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

    ; Network
    M550 *********** ; Set machine name
    M551 ********** ; Set password
    M552 P0.0.0.0 S1 ; Enable network and acquire dynamic address via DHCP

    ; Fans
    M106 P0 S0.3 I0 F500 H-1 ; Set fan 0 value, PWM signal inversion and frequency. Thermostatic control is turned off
    M106 P1 S1 I0 F500 H0:1 T45 ; Set fan 1 value, PWM signal inversion and frequency. Thermostatic control is turned on
    M106 P2 S1 I0 F500 H1 T45 ; Set fan 2 value, PWM signal inversion and frequency. Thermostatic control is turned on

    ; Custom settings are not configured



  • Does the hotend read temperature correctly?



  • yes



  • That's good, and indicates the VSSA fuse is OK. Could you try moving the hotend thermistor to the bed port?



  • Did that same issue that is I swapped them same readings



  • Could you post a photo of the Duet with both thermistors connected, please?



  • Here you go I hope….


  • administrators

    @my67nova:

    Did that same issue that is I swapped them same readings

    Just to confirm: with the bed thermistor plugged into the E0 thermistor connector and the hot end thermistor plugged into the bed thermistor connector, you still get -273 in the current bed temperature box?

    Please run M305 P0 and verify that the values it reports are as in your M305 P0 command in config.g.



  • T:100000.0 B:3950.0 C:0.00e+00 R:4700.0 L:0 H:0 X:0 from command sent
    M305 P0 T100000 B3950 C0 R4700 ; Set thermistor + ADC parameters for heater 0 from config

    so what is the next step?



  • Anyone???


  • administrators

    @dc42:

    @my67nova:

    Did that same issue that is I swapped them same readings

    Just to confirm: with the bed thermistor plugged into the E0 thermistor connector and the hot end thermistor plugged into the bed thermistor connector, you still get -273 in the current bed temperature box?

    Please can you answer this question.



  • Bed temperature stays the same regardless of what thermistor is plugged in. The only way I was able to effect a change to the reading was to use T value 1 in that case it reads 2000 degrees.



  • Also the -273 is on the display, the web app reads ERROR


  • administrators

    Looks like there is an issue with the bed temp channel. Please contact your supplier.


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