[SOLVED] No heater fault on hot bed


    My fault, heater protection is only triggered when the respective heater is active. I have T0 at the end of config.g so the hotend heater is always in active state but hot bed isn't. After trying to set hot bed to any temperature when thermistor is unplugged it triggers the heater fault.

    Original Post

    Firmware Name:	RepRapFirmware for Duet 2 WiFi/Ethernet
    Firmware Electronics:	Duet WiFi 1.02 or later
    Firmware Version:	2.0(RTOS)RC1 (2018-05-02b1)
    WiFi Server Version:	1.21
    Web Interface Version:	1.21.1-RC1

    I was just testing the heater fault detection and it is working as expected for the hotend heater. If I pull the thermistor plug temperature jumps to 2000°C and after max 15s the heater faults and I get

    Error: Temperature reading fault on heater 1: sensor open circuit

    in the Gcode Console of DWC.

    When I pull the plug for the hot bed thermistor, though, temperature also jumps to 2000°C but no heater fault will be triggered.

    > M570 H0
    Heater 0 allowed excursion 15.0°C, fault trigger time 5.0 seconds

    So it should trigger. What is wrong here?

    Heater related part of config.g

    ; Heaters
    M305 P0 T100000 B4725 C7.060000e-8 R4700           ; Set thermistor + ADC parameters for heater 0
    M305 P1 T100000 B4725 C7.060000e-8 R4700           ; Set thermistor + ADC parameters for heater 1
    M143 H0 S120                                       ; Set temperature limit for heater 0 to 120C
    M143 H1 S275                                       ; Set temperature limit for heater 1 to 275C
    M307 H0 A139.6 C763.4 D2.5 S1.00 V12.4 B0          ; Use PID on bed heater
    M307 H1 A577.9 C208.7 D6.7 S1.00 V12.6 B0          ; Use PID on hotend


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