Coal in ash

I have noticed in recent weeks there has been
More coal in my ash I have a Alaska Channing III
I use their Controll which is a solid state timer
With settings 1-6 that adjust my feed I have no
Other Controlls other than my combustion fan which
Runs 100% all the time and my blower motor.
Any ideas why this would happen? My stove is still
Burning nice and hot just seems like some coal isn't being
Used.

i think that is normal, to an extent. did you recently change coal suppliers?

No same supplier. I just wasn't sure if I was missing
Something with the stove. I cleaned everything out everything
Works. I don't know how much of a variance the solid state timers have
I don't know if mine is advancing to quick and the coal doesn't
Have enough time to burn before it cycles again?

Maybe you need to clean fines out of the grate?

it's typical with most stoves, you will always have some unburnt regular coal in your ash.

you'll see more unburnt coal in warmer temps compared to colder temps.

Thanks I wasn't aware of that and the temps have been higher.