# Thermal runaway **URL:** \ **Category:** LulzBot TAZ\ **Created:** [January 4, 2019, 5:36pm UTC](https://forum.lulzbot.com/t/thermal-runaway/6415 "2019-01-04T17:36:30Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![mcamou](https://avatars.discourse-cdn.com/v4/letter/m/ebca7d/32.png) [@mcamou](https://forum.lulzbot.com/u/mcamou)\ **Post date:** [January 4, 2019, 5:36pm UTC](https://forum.lulzbot.com/t/thermal-runaway/6415/1 "2019-01-04T17:36:30Z")
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](https://us1.discourse-cdn.com/flex020/uploads/lulzbot/original/2X/6/6ef6facd09c9e9b0d977be050459ba6da0887277.png) ---
**Author:** ![mcamou](https://avatars.discourse-cdn.com/v4/letter/m/ebca7d/32.png) [@mcamou](https://forum.lulzbot.com/u/mcamou)\ **Post date:** [January 4, 2019, 6:07pm UTC](https://forum.lulzbot.com/t/thermal-runaway/6415/2 "2019-01-04T18:07:37Z")
I just tried again and couldn’t even get the printer to heat up, now I’m getting “Heating failed E0” during preheat. ---
**Author:** ![Brent.I](https://avatars.discourse-cdn.com/v4/letter/b/ecc23a/32.png) [@Brent.I](https://forum.lulzbot.com/u/Brent.I)\ **Post date:** [January 4, 2019, 7:59pm UTC](https://forum.lulzbot.com/t/thermal-runaway/6415/3 "2019-01-04T19:59:31Z")
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](mailto:support@lulzbot.com) if you have any issues about the testing, or need further assistance. ---
**Author:** ![kcchen\_00](https://avatars.discourse-cdn.com/v4/letter/k/9dc877/32.png) [@kcchen\_00](https://forum.lulzbot.com/u/kcchen_00)\ **Post date:** [January 5, 2019, 1:12am UTC](https://forum.lulzbot.com/t/thermal-runaway/6415/4 "2019-01-05T01:12:44Z")
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. ---
**Author:** ![mcamou](https://avatars.discourse-cdn.com/v4/letter/m/ebca7d/32.png) [@mcamou](https://forum.lulzbot.com/u/mcamou)\ **Post date:** [January 19, 2019, 6:50pm UTC](https://forum.lulzbot.com/t/thermal-runaway/6415/5 "2019-01-19T18:50:56Z")
Thanks for the help! I re-crimped the thermistor wires as per [https://forum.lulzbot.com/t/dual-head-v3-very-inconsistent/5954/1](https://forum.lulzbot.com/t/dual-head-v3-very-inconsistent/5954/1) 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. ---
**Author:** ![mcamou](https://avatars.discourse-cdn.com/v4/letter/m/ebca7d/32.png) [@mcamou](https://forum.lulzbot.com/u/mcamou)\ **Post date:** [January 21, 2019, 8:18am UTC](https://forum.lulzbot.com/t/thermal-runaway/6415/6 "2019-01-21T08:18:06Z")
After 7 hours the print finished with no problems. Thanks! ---
**Author:** ![shellac](https://avatars.discourse-cdn.com/v4/letter/s/a88e4f/32.png) [@shellac](https://forum.lulzbot.com/u/shellac)\ **Post date:** [January 24, 2019, 5:47pm UTC](https://forum.lulzbot.com/t/thermal-runaway/6415/7 "2019-01-24T17:47:22Z")
😃 def. a thermistor