I watched 3 youtube videos just now about flyback diodes and this was the best one. The electronic switch is the same kind of switch inside the ultimaker but you are planning to use a physical switch. Probably if you used a huge switch like the light switch for your house - well the sparking will be minor inside and only create small pits if any inside the light switch that can probably last for many thousands of switchings. But this high voltage can be a bit tough on the fan as well.
Well in the video the voltage only got up to 40V so obviously a switch rated for 120V or 240V should be fine without the flyback. I'd still add the diode - if you are using a dimmer which is turning the fan on and off many times per second - that's a lot of 40V (every fan is different - could be 200V) spikes which can dammage the dimmer circuit. Note that a dimmer designed for AC powered equipment won't work with 24V DC. You need one designed for your situation.
https://www.youtube.com/watch?v=LXGtE3X2k7Y
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gr5 2,295
Well that sucks. I'd call the reseller immediately. Pretty much all of them can deal with this kind of thing.
However I've heard of similar sounding issues from people on the forum (but usually not on the first day!) and here are some ideas:
1) Unplug the Air Manager and the material Station cables from the S5 so that there is no communication between them and then power up the printer. Definitely give it at least 5 minutes. If it boots up fine then after you go through the initial setup, try turning the printer off and reconnecting the "bundle". This trick has helped many people.
2) Try the unbricking procedure also knows as "firmware recovery" procedure. There are some notes about this here:
https://support.ultimaker.com/hc/en-us/articles/360019088780-Firmware-recovery-procedure-for-the-Ultimaker-S3-and-the-Ultimaker-S5-mid-2020-
One reason the recovery procedure may help is that the "hard drive" in the S5, which is a solid state drive or a "flash drive", can get a few bits corrupted - especially after a few years of use but also there can be something called "infant mortality" which is just referring to the fact that electronics usually fail in the first few hours or otherwise last quite a long time.
One issue with the firmware recovery procedure is that it involves removing the bottom cover and inserting a uSD card - it's not a trivial procedure and you should talk to your reseller about this first.
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