I have a 1588 incubator and I plugged it in two days ago for the first time this year. I bought it last year (2012) and ran it four or five times with very sucessful hatches last year and it worked perfectly. I plugged it in yesterday and have decided that I don't think it is heating properly. There is no noise coming from the incubator except from the turner. I think i remember last year that it produced a low hum when it was plugged in. Anyone who has a newer 1588, please tell me if you "hear" any noise when it is running. The digital readout is reading perfectly and according to it, the temp and humidity fluctuates slightly within normal and the heating light goes on/off like normal, but if you stick your hand in the incubator, it does not feel much warmer than the room air. I just put in a separate thermometer to see what that reads. Any help on the noise question will be greatly appreciated. Thanks.