Re: ANTMINER S5: 1155GH(+OverClock Potential), In Stock $0.25/GH & 0.51W/GH
251 might be 251-256= -5degrees Celsius 
What do you expect when normal operating temps should be between 0 and 35 Celsius!
What do you expect when normal operating temps should be between 0 and 35 Celsius!
aah.. i guess i didn't read the specs. -5c degrees makes sense (it's cold right now)
If you are keeping the PSU's in the same enclosure (and hopefully giving them a decent load), make sure they just circulate the air rather than vent it, that may sort your problem. I think your PSU's fail before the the rigs shutdown.
no. the psu's don't fail, the system was set up to GET THAT HEAT OUT, not recirculate it. Its gotten so cold that i guess i broke the bottom limit.. NEVER expected that.