Heater fails when starting print



  • I just finished building my printer, and used the autotuning feature to tune my hotend and heated bed, when testing from pronterface heating both elements work fine, but once i try to print something i get the following error:
    [ERROR] Error: heating fault on heater 1, temperature rising much more slowly than the expected 0.0°C/sec

    This seems like an odd issue, and i can't find where it's coming from.
    I'm using the duet(eth)0.8.5 with the expansion 0.2

    I got the following values from autotuning, which i put in config.g:
    M307 H0 A79.9 C578.8 D8.5 B0
    M307 H1 A181.3 C144.7 D8.6 B0

    if more info is needed please ask me

    EDIT: Some more info as to what exactly happens, from pronterface when setting hotend temp, it heats up fine, reaches target. When i print a gcode, it will heat up the nozzle to target temperature, but when it's close to the target, it returns the error noted earlier.


  • administrators

    What firmware version are you using? Does the heater heat up at all?



  • i'm not sure about the version nr, but it's the latest version before the update where you get a config_override.g when using the M500 command, Yes it does try to heat it up
    Edit: It would be V1.16


  • administrators

    @napalm1432 said in Heater fails when starting print:

    i'm not sure about the version nr, but it's the latest version before the update where you get a config_override.g when using the M500 command, Yes it does try to heat it up
    Edit: It would be V1.16

    I remember fixing a bug some time ago that caused a similar symptom, so I suggest you upgrade the firmware.

    The A value for heater 1 looks too low. It's normally at least 300.



  • After updating firmware, can i just put in my config.g and everything should work the same? or are there other changes i need to keep in account?


  • administrators

    @napalm1432 said in Heater fails when starting print:

    After updating firmware, can i just put in my config.g and everything should work the same? or are there other changes i need to keep in account?

    Go to https://github.com/dc42/RepRapFirmware/blob/dev/WHATS_NEW.md and read the upgrade notes for the firmware version you want to install and all the ones before it that you are skipping.



  • That's gonna be a night of reading 😛 but will do 🙂


  • administrators

    @napalm1432 said in Heater fails when starting print:

    That's gonna be a night of reading 😛 but will do 🙂

    You can skip the lists of changes unless you are interested, it's the Upgrade Notes sections that are important.



  • I notice on the wiki on how to install new firmware the instructions all say Duet 2 Wifi, but, i did see i need other files for the duet0.8.5, which i downlaoded, do i just follow the instructions for duet2wifi, using the firmware for 0.8.5duet ?


  • administrators

    Yes, use the RepRapFirmware.bin file from the 2.02/1.22 release. You can use either the DuetWebControl 1.22.3 file in that release, or you can try 1.22.5 which is likely to be compatible too.



  • okay, i updated the firmware to V1.2, and am tuning the heater again, but everytime i get an error, Auto tune cancelled because target temperature was not reached, But it stops heating at about 160C while it's still rising

    EDIT: I also just realised, i use a 12V power supply, and the heater cartridge SHOULD be 12v as well, but what happens if the heater cartridge is rated at 24v?


  • administrators

    @napalm1432 said in Heater fails when starting print:

    EDIT: I also just realised, i use a 12V power supply, and the heater cartridge SHOULD be 12v as well, but what happens if the heater cartridge is rated at 24v?

    That would account for my earlier observation, that the A value you got from heater tuning is too low. If you have a multimeter, you can measure the resistance of the heater cartridge. It should be about 5 ohms for a 12v 30W cartridge, and about 19 ohms for a 24V 30W cartridge.



  • Okay so i checked, and yes, i did use a 24v one, i have multiple parts lying around, and assumed it was 12v, luckily i did have a 12V one, so i did the tuning with that, tested it out and it worked!!
    However, i had to extend the wires of the heatercable, and i did this after tuning and testing, and now i get an error again that the temperature rises to slowly (not the expected 0.7c/sec (i already changed the dead time value, first it was 1.6c/sec)).
    Do i have to retune the heater after extending the cable?


  • administrators

    @napalm1432 said in Heater fails when starting print:

    Do i have to retune the heater after extending the cable?

    Yes if the cable has a significant amount of resistance, e.g. more than 0.5 ohms.


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