At present I am running Hashfast Sierra Batch 2. on Ubuntu.

A couple of months ago I had an issue with 3 rd top the coolers . I replaced and it fixed the issue. 2 Days ago I have the similar issue with over heating . I replaced the fan , but after installing, I get the following issue.

Here is the error on console.
HFB 0 NOTICE: Hash Core Error: Still emitting hashes: die 0 core 0, count: 1300
HFB 0 NOTICE: Hash Core Error: Still emitting hashes: die 0 core 0, count: 1400
HFB 0 NOTICE: Hash Core Error: Still emitting hashes: die 0 core 0, count: 1500
HFB 0 NOTICE: Hash Core Error: Still emitting hashes: die 0 core 0, count: 1600

If I take out the third card and run the other 2 cards it Runs fine.

Any Ideas would be appreciated .