Are HW errors at all related to the pool you are mining from? My hunch is no... but I was sitting in the other room and my miner shot up to 100% fan speed for no reason (when I checked the miner status PCB/Chip temps were like 30/40 so that wasn't the cause). But my error rate was nearly 3% which is way above what it has been to date (read: the 22 hours or so it's been running).
HW = Hardware Faults. Not at all related to where the machine is pointed.
Are you overclocked?
Default 600 with temps on the lower end. I Save+Applied my miner config to reset the Miner Status page and everything seems to be back to normal. Now I'm just wondering what the hiccup was... oh well.