I too would double check the wire is connected correctly to the incubator. How tight is your tubing around the little spinning thing? Too tight and it could cause it not turn correctly. I would also not go for such a big jump in %. If your bator is showing 37% I would set the humidity 45% and see what happens. As Friday said the pump does not constantly spin, it goes in short burst then stops then a short burst again. Double check what you have set it too also, you may not have set 60% and It could have reached what you set so inturn will stop because it's reached its set level. It's easy done, I've done it before when setting up and had to go back and double check.