I have a used 1502 Sportsman & I am new to this. I had 12 eggs due the 21st. 9 of them were almost in their original state like on the first day. the last three were pipping but I suspect (dont know here) that the humidity was not what it should be. The humidity reader was never showing the correct temp needed. Actually the therm WOULD show the right temp only in a certain spot of the incubator. the humidity read was always low but I had a sponge, a wet rag, and a total of THREE pans of water in there which I would think has to be enough so what else could be wrong ??? I left the venting holes opened as they suggested but I would almost think the vent holes need to be covered up in order to keep the heat/ moisture in. I bought this unit and it was suppose to be in good working order (everything preset for chickens) so I am wondering what I need to do to fix this .. possibly one chick may make it but the poor thing is weak.