Incubator problem

[tom e]

So I set up the incubator for my hatching eggs, watched it for a day and temps were great. Put the eggs inside, and then noticed the temps were a little high yesterday afternoon. So I twisted the dial (hovabotor basic- no fans, no thermostat- I think it's on a rheostat) to turn it down just a bit. Later I looked at it when it was time for my evening egg turn: it was 120 degrees! I must have twisted it the wrong way..
I turned it down right away, opened it to cool it off and walked away worried.
This morning: 89 degrees. Jeez I'm having trouble.

Are the eggs likely done? It could have been about 4 hours at the high temp, overnight at the low.

I went to the coop later and it looks like I have a hen who's feeling broody. Is it possibly that they could be transfered to her since my incubator is proving problematic? Or should I just get the temp set and keep trucking?

I cracked open one egg, the yolk had a VERY pronounced white disk, bigger than I've seen on regular fertile eggs like we eat.

Mixed feelings on this, what would you do?

 

[FireTigeris]

Sounds like they started, but extended time that high will kill them, you can leave them and candle for day 5, hope to see a network of veins.

You will be very sure the hen is broody by then and not faking you out.

over 105*f (internal) will destroy the proteins- cooking the egg instead of incubating it- now to get the inside of an egg that hot takes time...

the low temp is less of a problem even overnight.

 

[tom e]

The thing that seems weird about the egg/ yolk is that it is quite 'runny'. Doesn't hold together out of the egg like a fresh egg would. I fear the proteins may be damaged from the heat. Maybe back to square 1..