Same here.
Chain 3 is completely missing from miner status. After the restart all chains powered, hashrate summary shows around 19GH/s and that's the number showing in my mining pool also. So it seems like chain 3 is working, atleast partially.
However chain 2 shows missing ASIC's and both chain 1 and 2 have lots of HW errors when chain 3 is powered. Chain 3 off both chains 1 and 2 are working just fine with only few HW errors. So it might be bad for healthy boards/main board to keep chain 3 connected.
Reloading firmware back and forth helps nothing, so it's propably hardware issue. On the other hand, now when I think of it, board 3 disappeared right after changing pool to Nicehash couple days ago. So who knows..
F**k it. I'm not sending them a hashboard and spend another $100-150 for this non-profit piece of s**t. Atleast not yet when I have 2,5 months of warranty time left and naturally something else will break during that time.
BTW, when did they change warranty time from 180 days to 90? For what I remember when ordering in early september, it was 180 days. Changing it post order is bullshit.
I thought I am going to run on 2 chains but My D3 is not working anymore . Created a ticket on bitmain site, since then never heard from them.
Thanks