Yes, It is the wafer kind. The temps stayed pretty stable (according to my thermometer - it records the 24 hr highs and lows). I kept it right at 100. I'll get a different kind of thermometer to add toIt is a bit different using a fan incubator. It takes a different technique.
It the1602 a wafer incubator?
The symptoms are consistent with temps too low.
the first one - maybe that will keep track of the temp better. I was reading online (today), that the air is supposed to come in through the holes at the bottom, and vent through the top. Is that right?
Does that mean that the fan should be "sucking" air out ? If so, my fan is turned the wrong way...

From the Incubator Warehouse website:
Invented by G.Q.F. Manufacturing Co. over 30 years ago, the Hova-Bator is still considered by many to be the WORLD’S BEST SMALL INCUBATOR, and among the most economical incubators available. The circulated air Hova-Bator uses a slower speed, gentle flow fan to hold a more uniform temperature. The gentle flow fan provides enough air movement to keep a constant temperature, but helps prevent dehydration of the eggs. It uses FORCED AIR FLOW, where the radiant heat tube gently warms the inside of the incubator while the fan draws fresh air from the bottom vents and circulates it throughout. Since heat rises, temperatures can vary up to 5 degrees inside the Still Air Hova-Bator. However, with the IncubatorWarehouse.com Gentle Flow Fan kit installed, the incubator holds a more constant temperature, minimizing hot and cold spots. This ultimately leads to improved hatch rates.