Bed heater alwasy display error in web interface



  • I am almost done with my CoreXY, all I have left is calibrating, but before I can do that, I am having a very troubling issue with the bed heater…
    In the web interface, on the bed heater box, it always displays error. If I unplug the sensor and plug it in the hotend 0 sensor, it will work... but never in the bed heater box...

    Thanks you for your assistance


  • administrators

    What temperature does it show for the bed heater when the sensor is connected?

    What values do you have in your M305 P0 command in config.g?

    Which firmware version are you using?



  • If I plug it in the E0 sensor, it displays 23.6 C, I looked in the console for the error code, all I found is:
    10:38:43 Disconnected.
    10:38:06 Connection established!
    10:38:06 Page Load complete!

    M305 P0 R4700 H0 L0 ; Put your own H and/or L values here to set the bed thermistor ADC correction
    M305 P1 R4700 H0 L0 ; Put your own H and/or L values here to set the first nozzle thermistor ADC correction
    M305 P2 R4700 H0 L0 ; Put your own H and/or L values here to set the second nozzle thermistor ADC correction

    Firmware Version: 1.18.1 (2017-04-09)



  • I am assuming that the error is probably due to the M305 P0 R4700 H0 L0, but then how come the P1 works…
    I did the RRF Configuration tool...
    Now
    M305 P0 T100000 B4138 C0 R4700 ; Set thermistor + ADC parameters for heater 0
    M305 P1 T100000 B4138 C0 R4700 ; Set thermistor + ADC parameters for heater 1

    And everything works.

    Thanks you


  • administrators

    If you are using an older Duet (0.6 or 0.8.5) then the bed thermistor T parameter defaults to 10K. So if you are using a 100K thermistor, that would account for the problem.


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