I found that when you put hot water in the trays it raises humidity real fast. There is probably still some water droplets around the incubator. Take it apart and dry it off, add cold water to tray 1 and then let the incubator heat up for a few hours, adjust the temperature until you have it around 99* F. Cold water does drop the temp for a while but it will slowly heat back up.
I had a large hatch over the past weekend and I had 3 duck eggs that I set slightly later than the rest, there was a ton of junk left in the incubator from the hatch so I quickly cleaned it out and when I put the water in I got water that was 100* F and put it in tray 1 and 2 for lockdown, the humidity went into the 90s, i'm lucky I was checking up on the incubator often because I was able to save the eggs. When I opened it up there was steam coming out and the eggs had water droplets all over them! That happened on monday, all 3 eggs have pipped now.