I just bought a used DGS-1210-48 for a home setup and have been trying to figure out a fan error issue. When buying it, it was disclosed that there was a fan error however with many guides on how to replace the fans I didn't think much of it. Bought a set of NF-A4x20 FLX (12v, 0.05 A) to replace both stock fans (12v, 0.12A) however not only do I still have the fan error but they will only spin up briefly during start up. Note that prior to replacing the fans, there was a fan error even though both fans were spinning, with one sounding like the bearing had gone.
Looking at the logs, no matter how many fans I have connected in what configuration it will always give me the same two entries when starting up "Side Fan failed" and "Side Fan is in low speed." (even when no fans are connected).
Right now I'm open to any idea on how to get the fans up and spinning!