# SV04 fan not turning on

**URL:** <https://forum.sovol3d.com/t/sv04-fan-not-turning-on/6180>\
**Category:** Sovol SV04 IDEX\
**Created:** [December 5, 2024, 2:38am UTC](https://forum.sovol3d.com/t/sv04-fan-not-turning-on/6180 "2024-12-05T02:38:54Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Diddi](https://avatars.discourse-cdn.com/v4/letter/d/ac8455/32.png) [@Diddi](https://forum.sovol3d.com/u/Diddi)\
**Post date:** [December 5, 2024, 2:38am UTC](https://forum.sovol3d.com/t/sv04-fan-not-turning-on/6180/1 "2024-12-05T02:38:54Z")

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Hey guys and gals,

I am having a major issue were neither fan turns on on extruder 1. I see nothing unplugged, no wired damage and I have tried flashing the firmware but no luck. The fans on extruder 2 turn on just fine. What can I do?

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**Author:** ![Bjoern](https://avatars.discourse-cdn.com/v4/letter/b/46a35a/32.png) [@Bjoern](https://forum.sovol3d.com/u/Bjoern)\
**Post date:** [December 5, 2024, 7:04am UTC](https://forum.sovol3d.com/t/sv04-fan-not-turning-on/6180/2 "2024-12-05T07:04:57Z")

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Hello Diddi,  
in general, the etruder fans should run at 100% speed when preocessing gcode`M107 P0 S255` for left fan and `M107 P1 S255` for the right fan. In case one fan is not working checking voltage using a multimeter could help to locate the problem: If the same voltage is present at both fan connectors you’ll need a replacement fan. In case of missing voltage you’ll need to check cables. [Here](https://github.com/jbu313mlb92ome8w/Sovol_SV04/tree/main/Photos) you’ll find a documentation of all SV04 pins & connections on the motherboard & gantry breakout boards which should help to find the complete electrical connection down to the motherboard.

Good luck!  
Björn

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**Author:** ![Lion](https://yyz2.discourse-cdn.com/flex030/user_avatar/forum.sovol3d.com/lion/32/5586_2.png) [@Lion](https://forum.sovol3d.com/u/Lion)\
**Post date:** [December 5, 2024, 1:05pm UTC](https://forum.sovol3d.com/t/sv04-fan-not-turning-on/6180/3 "2024-12-05T13:05:14Z")

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Typically, you should have a few fans as backups. Amazon usually sells them in 2, 4, 8 packs depending on the fan…JMO

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**Author:** ![Tigato](https://avatars.discourse-cdn.com/v4/letter/t/bbe5ce/32.png) [@Tigato](https://forum.sovol3d.com/u/Tigato)\
**Post date:** [February 18, 2025, 2:18pm UTC](https://forum.sovol3d.com/t/sv04-fan-not-turning-on/6180/4 "2025-02-18T14:18:38Z")

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Bom dia,  
Meu problema é que a cabeça da esquerd(1) não aquece e a tela não sai da barra de progresso, a cabeça da direita(2) aquece.  
já troquei o cartucho de aquecimento eo termistor e nada.  
alguém tem alguma dica pra solucionar o probela?  
já pensei em comprar a placa mãe, mas não consigo encontrar no brasil e nem em nenhum site da china.