Duet Wifi fans not working
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One thing counterintuitive to a lot of people is if you have one fan connected wrong or maybe bad it can kill them all. I presume it drags the supply down? It's happened to me. I got lucky and no damage occurred.
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I connected the fan to the always-on output and it's working but if I connect it to the PWM output it is not.
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@3drikat said in Duet Wifi fans not working:
I connected the fan to the always-on output and it's working but if I connect it to the PWM output it is not.
Which PWM output? There are 3. Of these, Fan 1 output defaults to thermostatic control based on hot end temperature, so you can't control it directly using M106 Snn command unless you disable the thermostatic function first.
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I tested all 3 of them. No one seems to be working.
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Could you post a clear, well lit photo of the area of the board around the fan headers?
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Is this ok? What is it that you can see on a picture like that?
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I can see blown FETs, at least one, possibly two, perhaps the third is damaged in a way that is not visible.
Connecting incorrectly likely damaged the FETs.
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What can I do about that? Is it possible to replace them?
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Sure, if you have a hot air rework station, or are skilled with a regular soldering iron.
https://duet3d.dozuki.com/Wiki/Connector_and_spare_part_numbers
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I will try it. Could you please mark the components on the picture. Because I am not 100% sure which one to desolder. And do I have to order PMV40UN2 or PMV40UN2R?
