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    Bed Thermistor reading keeps rising but the bed stays cold.

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    Duet Hardware and wiring
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    • RamonIn3Dundefined
      RamonIn3D
      last edited by

      Hello everyone

      I bought a Duet WIFI in October of last year, but never got around to actually using it, because a lot of things got in the way. Now that i have more time, i finished the Printer build (P3Steel Toolson mk2) and wired most of it up to the Duet to test things.

      The Problem:
      -The Bed thermistor reading just keeps rising as soon as i turn the Printer on.
      -The actual Temperature doesnt rise at all, it stays cold. It only heats up when i tell it to go over the temperature its currently "reading", so Heating would work.
      -The Temperatureading rises very quickly up to about 90°C and slows down until it just goes up by 0.1°C every 10 seconds or so after about 126°C (The bed is still cold though)
      -Same Problem without anything connected
      -Same Problem with Hotend Thermistor connected
      -Same Problem when connected with a jumper

      Information about the Printer:
      -Duet Wifi, bought 19/10/2016
      -800W 24V Power Supply
      -200W Silicone Heater with a "100k Thermistor" (FilaFarm FilaBase)
      -E3D V6 24V
      -5V Radial Print cooling Fans connected + to 5v and - to Fan0 gnd
      -24V Hotend fan connected to Fan1

      Temperature settings in config.g:
      ; Heaters
      M143 S300 ; Set maximum heater temperature to 300C
      M305 P0 T100000 B4725 C0 R4700 ; Set thermistor + ADC parameters for heater 0
      M305 P1 T100000 B3950 C0 R4700 ; Set thermistor + ADC parameters for heater 1

      Firmware Version: 1.19.2 (2017-09-01)
      WiFi Server Version: 1.19.2
      Web Interface Version: 1.19

      Edit: I assigned the bed thermistor to E1 Thermistor for now, so i can test the bed and hotend together. Everything works just fine so i guess there is a problem with the bed thermistor input. This works but i would still like to know whats wrong so i can avoid doing it again.

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