After 19 hours of printing: Printing paused:heater fault

  • I start my first print, everything is absolutely perfect, is incredible the quality of the prints now….
    But, after 19 hours the display show this:

    The machine is paused, how i can continue without lose the print part?
    What i can check? What happen? What heater is broken? I can see some log?

    Duet Wifi Version 1.21 RC5

  • In Gcode Console i found 4 messages likes this:

    What mean?

  • administrators

    You can clear the heater fault using M562 (see then press Resume. But see the wiki page on spurious heater faults after your print finishes.

    That message suggests a corrupted gcode file.

  • Corrupted gcode file? I do with simplify3d like always before.
    Can i see something in this?

    But you check than show: Error: temperature reading fault on heater 1.
    I use Thermocouple K, is possible than do a problem and if show 2000ºC happen this fault or not?

  • I do M562 but the error happen again!, is continuously

  • administrators

    If it's happening continuously and it was working before, then something has changed e.g.:

    • Thermocouple has become disconnected from the daughter board
    • Thermocouple is shorting to the heater block
    • Thermocouple broken (gone open circuit)

  • Finally i restart the machine….
    and now happen this:
    I Preheat and the temperature go up 4-5 seconds but show this....
    Error: Heating fault on heater 1, temperature rising much more slowly than the expected 1.7°C/sec

  • administrators

    Have run M303 tuning on that heater/thermocouple/hot end combination since you last changed anything?

  • Not. I do the first time and the config is saved in config-override and i don't touch anymore

    i am doing in this moment a new M303, by the way i add in Config M570 H1 P60 T15.

    A question, is possible restart for the point where the machine was paused?

    I have this info in the file resurrect.g:

    ; File "r2d2_-_leg_left.gcode" resume print after print paused at 2018-03-21 14:53
    M140 P0 S50.0
    G10 P1 S245 R245
    T1 P0
    G10 P0 S225 R225
    T0 P0
    M98 Presurrect-prologue.g
    M106 P0 S1.00
    M106 P3 S0.00
    M106 P4 S0.00
    M106 P5 S0.00
    M106 P6 S0.00
    M106 P7 S0.00
    M106 P8 S0.00
    M106 S255.00
    M290 S0.000
    G92 E0.00000
    M23 r2d2_-_leg_left.gcode
    M26 S6360220 P0.000
    G0 F6000 Z28.000
    G0 F6000 X637.04 Y347.85
    G0 F6000 Z26.000
    G1 F3030.0 P0

  • administrators

    You may be able to resume the print when you have fixed the heater issue, but you will need to set up your resurrect-prologue.g file first. See

  • I do M303 H1 S225 P0.5

    M307 H1
    Heater 1 model: gain 336.2, time constant 308.0, dead time 6.2, max PWM 0.50, calibration voltage 24.0, mode PID, inverted no, frequency default
    Computed PID parameters for setpoint change: P26.3, I0.600, D114.5
    Computed PID parameters for load change: P2

    OLD value: M307 H1 A393.5 C296.9 D6.1 S0.60 V24.0 B0
    New value: M307 H1 A336.2 C308.0 D6.2 S0.50 V24.0 B0

    Something rare? I have 40W 24V e3dv6

  • administrators

    The gain has gone down from 393 to 336, which is nearly 20%. That implies either that your heater has lost power, or that cooling of the hot end has increased. Check that the screws in the extruder heater terminal block on the Duet are still tight.

  • I see a thing….
    the old value is with: M303 H1 S225 P0.6
    the new value is with: M303 H1 S225 P0.5

    is important this, or is indifferent?

  • administrators

    Why are you using a PWM factor other than 1 when running M303? It's been standard to use full PWM when running M303 for several firmware versions.

  • This is incredible, now i do: M303 H1 S225 P0.5 and say:
    Auto tune cancelled because target temperature was not reached

    If i do: M303 H1 S225 say:
    Warning: Heater 1 appears to be over-powered. If left on at full power, its temperature is predicted to reach 735C.
    Auto tune heater 1 completed in 436 sec
    Use M307 H1 to see the result, or M500 to save the result in config-override.g

    Now the value in config-override is: M307 H1 A710.6 C318.6 D9.7 S1.00 V23.9 B0

  • administrators

    Like many users, you have an over-powered hot end heater. You can still print with those values. For safety reasons you may wish to order a lower power heater cartridge.

  • I start the print again from the beginning, and after 20 hours now i can see than the temperature NOT is estable, why??
    The first 20hours (aprox) is absolutely stable +/-1º and now with 30 hours:….

    Now go from 216ºC to 233ºC

    Of course same temperature is config in all print in 225º and only use T0
    the value in config-override is: M307 H1 A710.6 C318.6 D9.7 S1.00 V23.9 B0

    I don't have configured line M570 so i am frightened for the print, maybe go to give some error if the temperature continue fail?

    Not errors show in console. I don't have fans or something than can cool the nozzle, chamber closed and same temperature in bed always

  • administrators

    Undulating temperature usually means that the dead time parameter (D in M307) is too low. It could mean that the thermal contact between your heater cartridge and the heater block isn't as good as it used to be.

  • This extruder is used several months with arduino and marlin firmware without problems, i check the wires and thermal contact and absolutely ok.
    The question is, Why after 20 hours start to fail?
    I am thinking in use the M301 with PID parameters than i was use in the marlin firmware, instead of M303 system.
    I don't finish to work perfectly with this M303 auto tuning

  • administrators

    If it used to work but doesn't any more, then something must have changed. Your dead time parameter does look unusually high, suggesting that heat transfer from the heater cartridge to the heater block isn't as good as it should be. Values around 6 seconds are more usual for E3DV6 and similar hot ends. What type of hot end is it?

    You could try running M303 tuning again and see if the dead time parameter has changed.

  • This:

  • administrators

    Copper has a thermal capacity per unit volume about 50% higher than aluminium, so that explains the 50% higher dead time.

    I suggest you increase the D parameter in the M307 H1 command enough to make the undulations go away. Try increasing it by 20%.

  • I faced similar issue: searched forum, but none of the proposed solution helps.

    as a sudden it gives heater fault. im on 1.21…

    1-a) i replaced heater cartridge and checked all connections, including PT-100.
    all looks fine. Run M303 H1 P1 S230 . No issues… M500 ..

    1-b) after restart and even after power off problems does not disappear.. 😞
    printer does resume with m562 + m916 but minutes later all repeats again…

    2-a) increased tolerance M570 S120 H1 P10 to avoid some peaks.
    2-b) after M562+M916 it starts printing, but in less than a second temperature starts dropping very slowly.
    chart is clean (no spikes, holes etc)

    1. i thought it is a large file… tried to print 101010 cube. same at around 50% completion ....
      replaced SD card, no luck. i think i have tried everything but PT-100 sensor that i do not have in stock...

    what can i do to fix the issue???

    [c]21:30:42 Error: Heating fault on heater 1, temperature rising much more slowly than the expected 0.3°C/sec
    21:30:32 T-1
    21:30:30 M562
    21:29:48 Printing paused
    21:29:46 Error: Heating fault on heater 1, temperature excursion exceeded 15.0°C
    Resume-after-power-fail state saved

    M307 H0 A90.0 C700.0 D10.0 S1.00 V0.0 B1
    M307 H1 A272.9 C189.4 D2.2 S1.00 V12.0 B0
    M307 H2 A340.0 C140.0 D5.5 S1.00 V0.0 B0
    M307 H3 A340.0 C140.0 D5.5 S1.00 V0.0 B0
    M307 H4 A340.0 C140.0 D5.5 S1.00 V0.0 B0
    M307 H5 A340.0 C140.0 D5.5 S1.00 V0.0 B0
    M307 H6 A340.0 C140.0 D5.5 S1.00 V0.0 B0
    M307 H7 A340.0 C140.0 D5.5 S1.00 V0.0 B0

  • administrators

    The "temperature rising more slowly than expected" error normally means the heater has not been tuned. You saved the results to config-override.g with M500, but does config.g have a M501 command at the end to run config.g?

    The "temperature excursion exceeded" error is explained on the wiki page. The error message you pasted says the limit is 15C (the default), which is not what your M570 command indicates.

  • David, can it be something with my board or firmware (fault detection algorithm) ??
    i replaced heat cartridge again... and system was printing fine for a day or two. yesterday as a sudden heater fault again.
    i pulled it from outlet and decided to try next morning... results are very strange... very.

    my steps:

    1. i switched system on and
    2. almost immediately connected via web interface.
    3. almost immediately i faced "temperature excursion exceeded 15.0C"

    in wiki this error residing in "maintaining temperature" section. but in my case it was only heating up for few seconds.

    config.g related
    M563 P0 D0 H1 F0
    G10 P0 S200 R180
    M570 S120 H1 P10 T15
    M305 P1 X200

    @dc42, how that can take place???? how does duet board detect failure???
    is there something i can test on the board?


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