# Fan Shim LED is White

**URL:** <https://forums.pimoroni.com/t/fan-shim-led-is-white/11654>\
**Category:** Support\
**Created:** [September 18, 2019, 9:55am UTC](https://forums.pimoroni.com/t/fan-shim-led-is-white/11654 "2019-09-18T09:55:53Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![toml\_12953](https://avatars.discourse-cdn.com/v4/letter/t/e5b9ba/32.png) [@toml\_12953](https://forums.pimoroni.com/u/toml_12953)\
**Post date:** [September 18, 2019, 9:55am UTC](https://forums.pimoroni.com/t/fan-shim-led-is-white/11654/1 "2019-09-18T09:55:54Z")

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The LED on the FAN Shim is almost always white (all LEDs on) Once in a while it turns red or green but usually it stays white. How can I get it to accurately reflect the temperature thresholds I set (using the Fan Shim recommended values)?

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**Author:** ![alphanumeric](https://sea2.discourse-cdn.com/flex016/user_avatar/forums.pimoroni.com/alphanumeric/32/2729_2.png) [@alphanumeric](https://forums.pimoroni.com/u/alphanumeric)\
**Post date:** [September 18, 2019, 11:14am UTC](https://forums.pimoroni.com/t/fan-shim-led-is-white/11654/2 "2019-09-18T11:14:07Z")

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Do you have anything else connected to the GPIO?  
Is OneWire enabled, if yes turn it off and see if that fixes it.

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**Author:** ![toml\_12953](https://avatars.discourse-cdn.com/v4/letter/t/e5b9ba/32.png) [@toml\_12953](https://forums.pimoroni.com/u/toml_12953)\
**Post date:** [September 18, 2019, 3:33pm UTC](https://forums.pimoroni.com/t/fan-shim-led-is-white/11654/3 "2019-09-18T15:33:36Z")

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No, nothing else is connected. I have a blinkenbone server for my PiDP-8 that uses all the GPIO pins but I stopped it and the problem still happens.

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**Author:** ![alphanumeric](https://sea2.discourse-cdn.com/flex016/user_avatar/forums.pimoroni.com/alphanumeric/32/2729_2.png) [@alphanumeric](https://forums.pimoroni.com/u/alphanumeric)\
**Post date:** [September 18, 2019, 5:41pm UTC](https://forums.pimoroni.com/t/fan-shim-led-is-white/11654/4 "2019-09-18T17:41:37Z")

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A bit of a pain but I’d do up a new fresh image of Raspbian and reinstall the Fan Shim software. That should tell you if its a hardware or software issue. Its a smart LED, normally it has to be told to light up, it won’t do it all on its own.

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**Author:** ![toml\_12953](https://avatars.discourse-cdn.com/v4/letter/t/e5b9ba/32.png) [@toml\_12953](https://forums.pimoroni.com/u/toml_12953)\
**Post date:** [September 18, 2019, 6:06pm UTC](https://forums.pimoroni.com/t/fan-shim-led-is-white/11654/5 "2019-09-18T18:06:43Z")

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It’s not too much of a pain. I’ll just use a new SD card. I don’t have to modify my current SD card. That’s one thing I like about Raspberry Pi. You can switch OSes as fast as you can swap an SD card.

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**Author:** ![alphanumeric](https://sea2.discourse-cdn.com/flex016/user_avatar/forums.pimoroni.com/alphanumeric/32/2729_2.png) [@alphanumeric](https://forums.pimoroni.com/u/alphanumeric)\
**Post date:** [September 18, 2019, 6:46pm UTC](https://forums.pimoroni.com/t/fan-shim-led-is-white/11654/6 "2019-09-18T18:46:16Z")

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Totally agree, that is one nice feature that can bail you out and save having to customize everything all over again. For a long while I had more Raspberry Pi’s than Micro SD cards though. I’ve only just recently evened the score. I have 24 or so Pi’s kicking around here.