I would slowly (over a period of hours to give the incubator time to heat up) raise the temperature until your aquarium thermometer says 99.5 f. then monitor to see if the incubator continues to stay close to that tempThe incubator itself is saying it's at 38.4°C. And occasionally goes to 38.3°F but starts heating up. Currently the thermometer from the incubator is not touching or close to eggs. I believe the fan is working as I can hear and feel it. Hoping as the house warms up again it will get back to ideal temps.