My name is Peter. I am a retired field service refrigeration technician.
You do not have a 9V battery in your unit. It is usually located on the right hand side of the bottom toe plate. There is a small door. This is just a batter backup if you loose cooling or power.
CE means Communication Error. It is like the check engine light on your car. It just tells you that there is something wrong. The 'd' means door seal. There are no sensors or electronics connected to your door seal.
1.) Is your freezer fan running?
2.) Is your lower back condenser fan running?
If they are running the problem is with your main control board. This is located behind your freezer, on the left hand side and mounted on the side wall with several screws. This is a easy part to replace.
PART NUMBER: 216979700 Cost: $134.00
There are only several connectors on the back and a main cable connector.
If you elect to do the work your self, make sure you ground yourself by touching bare metal. Static electricity will knock out a board. Needless to say before the start of work unplug your unit.
If you were to call me when I was a service tech, I would double the part cost plus at least $140.00 labor.