I was told my Bitmain to troubleshoot the issue on my 2 bad miners not hashing. I tried changing fan settings and putting new fans on with no change. One step was to take a good controller card from another miner and put it onto the bad miner to see if it is the controller card that is bad. It showed the same results on the bad miner as the old controller did. BUT when I returned the good controller, it too was now showing 48 ASICS and is now not hashing. I now have 3 bad miners. I have sent pics and all of this information back to Bitmain. I have asked to have 3 new machines sent to me. I am wondering what they will determine.
Read the warranty policy.
https://www.bitmaintech.com/productDetail.htm?pid=00020150827084021471OHYdwd9D06A0
4. Customer must return the defective parts at own expense after opening a support ticket and troubleshooting with Bitmain's instructions.