Hardware errors do not mean they will damage the hardware, and they have absolutely nothing to do with difficulty.
They just mean that they are running too hot, lower the clockspeed or increase the cooling.
sometimes they mean the power supply is failing. you can also pull one of the 10 blades to reduce the load on the psu.
the s-2 has been known to be supplied with an under powered psu.
Yes, but it doesn't have anything to do with the ASIC itself, its not goong to burn and explode or anything.
Add more cooling and see if the hardware errors go down. If not, lower the clock and if not, check PSU.