hatching not a success

[jenny61]

This time last week I was waiting for my eggs to hatch, Out of 24 eggs 6 chickens hatched.
so Monday came 3 days after hatching date so I decided I wasn't getting anymore eggs to hatch
so I broke open the eggs to see way,15 eggs hadnt even started to do any thing it was just like cracking open
an egg only it was liquid and 3 other eggs had chickens in them but they had died and this black
stuff come out as well.
I contacted the person who sold me the eggs he reckons nothing wrong with his eggs reckons my incubator had a bacteria in it
I think the 15 eggs were not fertilised that's why nothing happened with them as my incubator was thoroughly cleaned and fumigated
and was running for a week before I got my eggs and every thing was working fine
any ideas what might have gone wrong or do you think it was the eggs not being fertilised first time chicken egg hatcher

 

[Wyandottes7]

If the eggs that didn't hatch were completely clear and had no chicks developing in them, then they weren't fertile (or the embryo died very early on).

The eggs that didn't hatch, and had dead chicks inside of them, may not have hatched for many reasons. Sometimes chicks are weak and don't hatch. Other times, bacteria can cause it, or the wrong temperature or humidity.

 

[Orca5094]

Were the eggs shipped to you, or did you pick them up yourself? Shipped eggs have a pretty low hatch rate due to damage that can be done inside the eggs that we can't necessarily see. Many of them will die very early on in incubation, or not develop at all even if they were fertilized.

If you picked them up yourself, it could've been an incubation problem. Variations in temperature/humidity during incubation can cause many problems for the eggs and give you a lower hatch rate. No incubator is perfect, unfortunately. Was the temp/humidity pretty consistent during incubation?