my nano 3s was working great - one day I changed the pool information and hit reboot - it has not worked since.
it says something about incompatible power adapter - the psu works on other nano 3s no issues and other working nano 3s psu's give the same error.
canaan was no help (I was 4 months past warranty end date)
note: it does power up and the app can see it and will connect but miner does not hash. and the error about the psu stays on the screen.
my 2 did that. so I gave up on the company.
This same thing happened to a friend, it scared the shit out of me that I had to sold my nano3 for a bit cheaper price and I don't even mind, some people on Reddit complained the same.
I don't know why I don't take my time to do some research before purchasing that miner, they do got me though with good bargain on AliExpress, bought one for myself and one for a friend.
Worst purchase ever even though mine don't die or stopped working, my friend digested the loss but I can tell that he isn't happy at all.