I started a new thread because no one was replying to my old thread about this and I need to figure this out soon. So, let me give a brief history to get this thread up to speed. I have Hova-bator 1588 with an automatic egg turner that is full with 42 eggs. I stabilized the incubator for 48 hours at 99.5 degrees before putting the eggs in. It worked fine for a couple of days and then the temp started to climb slowly. It got up to 101 and stayed there for over 24 hours. I decided to lower the temp. I have the old model 1588 with the eight little switches and switch 4 come on from the factory so I turned it off and turned switch 3 on. The temp went down to 99.8 for about a day and then started to climb again back up to 101. When it did not go down again for a day., I lowered the thermostat again to switch number 2. the temp again went down to 99.8, but once again it has climbed up to 100.8 and is rising. Just to cover the bases and to keep from going over the same things we have already covered. The incubator is in a small 10X12 foot room with only one window that has the curtain drawn, so there is no sunlight issue here. The room is temperature controlled to never go over 68 degrees. I am using room humidity to control the humidity of the incubator per the instruction found in this article about dry incubation: https://www.backyardchickens.com/a/how-to-incubate-hatch-eggs-using-the-dry-incubation-method. The room humidity is set to 50% and the internal humidity level of the incubator has held at 30% pretty steadily. This a new incubator that purchased in February and this is only it's second time to be used. The first time I only had 20 eggs in it and tried the wet incubation technique which was almost a complete failure. Only one chick hatched out and 10 chicks drowned. The incubator temp held very steady at 99.5 during the first batch. I am baffled as to what might be causing the temp to rise, but I have pretty much narrowed it down to these two things. Either the thermostat on the incubator is bad, or the full tray of eggs is causing the turner motor to heat up so much that it is able to heat the incubator by itself. The little motor is very hot when I touch it. Anyone have any ideas on this?