I recently had a fan go out on my AntMiner S4.  Upon reading the following article, I ordered Delta PFC1212DE fans as a replacement.

https://bitmain.zendesk.com/hc/en-us/articles/204199879-Antminer-S4-fan-specification-and-possible-replacement-fans

I replaced the front and back fans, closest to the PSU.

The colour of the wires were not the same on the old and new fans.  They both had red, black, and blue which I connected together.  The 4th wire on the old fan is white which I connected to a yellow wire on the new fan.

Now when I turn the S4 on, the old fans power up as normal, but the new fans only come on for a few seconds and then shut off.

The S4 will run for a while before stutting down due to overheating.

Any suggestions would be appreciated.

Tom Travis