CS4i? Is there an issue?

Just taking a break from the mower and went to charge my Krait, plugged in the CS4I, which only has about an hour on it, and the inverter fan kicks in then turned on the water then hit the go button. Shut down immediately! Hum...
So I hook up 12V thinking the inverter might be bad? Nope, well it could be i guess but still no workie.
So open it up looking for the fuse like on my other compressor (which is in Oregon and I'm in South Dakota) and no fuse to be found? Okay we'll I'm going to try it again just cause I'm not sure what to do anyways. Guess what worked just fine!! Don't know why, don't care long as it works but any thoughts on what might i look for if there is a next time??
Thx, Greg