My incubator is a R-com King Suro and it never ever in more than 10 years had any glitches or issues whatsoever.
Depending on the particular condition of the hatching eggs, I will vary the settings and that is all.
You could explain to your children that only fresh, undamaged and fertile eggs have the chance to hatch a chick, and that depending on the condition and health of the parent stock, some eggs although fertile, just don't make it.
Failure to hatch does not always have to do with the incubator or your handling.
Depending on the particular condition of the hatching eggs, I will vary the settings and that is all.
You could explain to your children that only fresh, undamaged and fertile eggs have the chance to hatch a chick, and that depending on the condition and health of the parent stock, some eggs although fertile, just don't make it.
Failure to hatch does not always have to do with the incubator or your handling.