# Thermal runaway issue- stumped

**URL:** <https://forum.lulzbot.com/t/thermal-runaway-issue-stumped/24381>\
**Category:** LulzBot TAZ\
**Created:** [April 3, 2022, 11:11pm UTC](https://forum.lulzbot.com/t/thermal-runaway-issue-stumped/24381 "2022-04-03T23:11:52Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Jonathan\_Hils](https://avatars.discourse-cdn.com/v4/letter/j/8edcca/32.png) [@Jonathan\_Hils](https://forum.lulzbot.com/u/Jonathan_Hils)\
**Post date:** [April 3, 2022, 11:11pm UTC](https://forum.lulzbot.com/t/thermal-runaway-issue-stumped/24381/1 "2022-04-03T23:11:52Z")

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Out of nowhere, I started to get a thermal runaway error on my Taz 5 running Firmware 1.9.34. I swapped out the SE tool head to another unit and still got the error. So I ordered a new V2C cable and a new tool head adapter, thinking there might be a wiring issue but after installing these new parts-- I still got an error 2.5 hours into a print. So, I then installed my M175 tool head and updated the firmware to 2.0 through Cura SE. I am STILL getting an error intermittently on every 2-3 prints over 3 hours. I’m completely stumped. Is this now a board issue? Is something failing there? I did watch the nozzle and bed temps occasionally and found the nozzle meandering between 195 - 208c on a print set for 205c. The bed was stable at 65c. I have never been at the printer when the error happens.