Thermal runaway

A forum dedicated to the stock LulzBot TAZ 3D Printer
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mcamou
Posts: 29
Joined: Mon Mar 07, 2016 12:14 pm

Thermal runaway

Post by mcamou » Fri Jan 04, 2019 11:36 am

Hi,

I have a Taz 5 with a Dual Extruder v3 and Marlin 1.1.5.44. It has been working fine so far. However, yesterday it stopped about 20 minutes into a print with a warning on the LCD regarding Thermal Runaway. I tried again today, same thing (this time after about 13 minutes). I am attaching a screenshot from the OctoPrint temperature graph. T0 (red) is set to 230º, T1 (yellow) is off, bed (red) is at 90º. From this graph it seems that at some point the thermistor goes crazy. Any ideas what might be wrong and/or what I can do to fix this?

Thanks!
Screenshot_20190104_183456.png
Last edited by mcamou on Fri Jan 04, 2019 12:12 pm, edited 1 time in total.

mcamou
Posts: 29
Joined: Mon Mar 07, 2016 12:14 pm

Re: Thermal runaway

Post by mcamou » Fri Jan 04, 2019 12:07 pm

I just tried again and couldn't even get the printer to heat up, now I'm getting "Heating failed E0" during preheat.

Brent.I
Aleph Objects | LulzBot
Posts: 491
Joined: Mon Jan 20, 2014 8:21 am

Re: Thermal runaway

Post by Brent.I » Fri Jan 04, 2019 1:59 pm

If you are unable to get any heating up, it could be you have a failed heater cartridge. If you measure the resistance at room temperature, it should read ~20koms. If this is open, or significantly off it could be that it needs to be replaced.

Feel free to reach out to support@lulzbot.com if you have any issues about the testing, or need further assistance.

kcchen_00
Posts: 1688
Joined: Thu Feb 19, 2015 12:42 am

Re: Thermal runaway

Post by kcchen_00 » Fri Jan 04, 2019 7:12 pm

Check the thermister... looks similar to the bad crimp issue.

Try to re-crimp the two pins on the connector with pliers or a dab of solder. Or just get a new thermister and swap it out.

mcamou
Posts: 29
Joined: Mon Mar 07, 2016 12:14 pm

Re: Thermal runaway

Post by mcamou » Sat Jan 19, 2019 12:50 pm

Thanks for the help! I re-crimped the thermistor wires as per viewtopic.php?t=7584 and it seems to have worked... I am 40 min into a print and the temperature is rock-solid so far. I will report back once the print is finished.

mcamou
Posts: 29
Joined: Mon Mar 07, 2016 12:14 pm

Re: Thermal runaway

Post by mcamou » Mon Jan 21, 2019 2:18 am

After 7 hours the print finished with no problems. Thanks!

shellac
Posts: 15
Joined: Tue Jun 23, 2015 11:40 am

Re: Thermal runaway

Post by shellac » Thu Jan 24, 2019 11:47 am

:D def. a thermistor

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