# Herratic Behavior on MCU temp

**URL:** <https://klipper.discourse.group/t/herratic-behavior-on-mcu-temp/2933>\
**Category:** General Discussion\
**Created:** [May 19, 2022, 8:35pm UTC](https://klipper.discourse.group/t/herratic-behavior-on-mcu-temp/2933 "2022-05-19T20:35:21Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![MrCrashalot](https://avatars.discourse-cdn.com/v4/letter/m/a587f6/32.png) [@MrCrashalot](https://klipper.discourse.group/u/MrCrashalot)\
**Post date:** [May 19, 2022, 8:35pm UTC](https://klipper.discourse.group/t/herratic-behavior-on-mcu-temp/2933/1 "2022-05-19T20:35:21Z")

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Just installed a SKR mini E3 V3 and flashed it on my modified Ender 5. Before the new MCU, I was using the built in sensor in the controller to control the mainboard fan via a TEMPERATURE\_FAN but since installing the new one, I noticed some weird behavior. The temp seems to drop ~20C and behaves herraticaly and thus I cant use this sensor in the control loop. I`m trying to figure out if this is a software, config or hardware problem. Klipper and Rpi are updated.

 ![image](https://global.discourse-cdn.com/free1/uploads/klipper/original/2X/4/47ee802575a995e65bd3c3b2939875cccbedf8db.jpeg)

Any help is appreciated.

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**Author:** ![EddyMI3D](https://yyz2.discourse-cdn.com/free1/user_avatar/klipper.discourse.group/eddymi3d/32/1981_2.png) [@EddyMI3D](https://klipper.discourse.group/u/EddyMI3D)\
**Post date:** [July 6, 2024, 5:49am UTC](https://klipper.discourse.group/t/herratic-behavior-on-mcu-temp/2933/2 "2024-07-06T05:49:28Z")

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Closed on July 6, 2024, 5:49am UTC