So sorry to hear that. Temperatures above 103 for any length of time is fairly lethal. If it stayed more toward 101-102 then I would say your odds would be better. The only way to know is to candle them at day 10 and again on day 14 and see if they are progressing. I would imagine you would probably lose those closest to the heating element and the ones furthest away may be fine. There is always a chance some survived, they did on other hatches that you had this unknown problem on. The decision is of course up to you, but i would give them a few days and see if they are indeed developing or not and weed out the ones that didn't make it. Catching it a this point may increase your rate, only time will tell.
I am sure you thought of this, as hind sight is always 20/20, but i always have a small cheap glass bulb thermometer as a backup to my digital. Sometimes those darn things just don't work right.