Neff K3990 Fridge Freezer ice maker not working and water leaking out

Can you remove the freezer rear panel again and take some photos of the frost pattern so I may see what is stopping the cold airflow to the fresh food section?I'm here on Fixya if you have questions
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If the freezer temperature is freezing or below, as it should be, you should be getting ice. I would place a thermometer in the freezer to check the temperature. It would take a while for your frozen good to thaw out in a 33 degree freezer, but ice would not form in your icemaker at that temperature. Set your temperature lower after checking.

its the compresor packed up,,,if this compresor is not pumping freezer gas around the pipe work the freezer wont work sorry but a new compresor is not a cheep thing to have fitted as it will need a re-gas as well

The ice maker unit give the command to the water valve to relese water for a short time.
you cna check with volt meter on the water volve that got the pip go to the ice maker unit if it getting 120V for short time when the fingers of the ice maker making full round.
if you get 120v the problem is the valve (the ice maker and the water have difrent water path so its difrent valve used) if you dont get 120v or the fingers of the ice maker not turning then its your ice maker unit need to be replace.

I hope you find this Very Helpful and best regards!

there is a defrost mode that melts any frost or ice on the evaporator coils and drains it into a pan under the fridge. if that drain is blocked, the water will pool inside. also check the door seals. if warm moist air leaks in, it'll condense on the cold interior and pool as well.

You can use a hairdryer on the frozen parts.
The fridge gets its cold air from the freezer through a vent(damper) between the freezer and fridge.The fan in the freezer blows air through it. There is a flap you adjust with the fridge temp. control. Make sure it's opening and closing when you adjust the fridge temp ..

Hi i have installed my american fridge freezer DAEWOO FRSU20DC but the ice cube maker don't seem to be working. There is not even any water going in to the ice cube tray but there is water going to the water one. Hope someone can help thanks

Sounds like a blocked defrost drain. By "American" I presume you mean side-by-side.
I had a similar problem with a freezer-on-top style Samsung. The solution to that was to defrost the freezer, remove the false backing plate in the freezer (required removal of the ice cube tray. the panel just pops out with a bit of pulling). The drain hole beneath the freezer coils was blocked with ice. This drain passes down into the fridge and then out the back of the fridge into the evaporation pan next to the motor. There is a collector pan under the freezer coils, this and the drain hole were filled with ice. When the freezer goes into its self-defrost cycle the water collects here and then overflows into the fridge.
I removed the ice with hot water/vinegar mixture (so it doesn't re-freeze immediately) and simultaneosuly used a bit of chiselling with a screwdriver to clear the drain plug. I did this from inside the fridge working up the drain hole into the freezer. The whole job took about an hour.

call for factory service

Defrost the unit for two days with the doors open...I know you're going to lose your contents. You may have ice on the coils internally. Next make sure you've cleaned the external coils under the unit. Leaving liquids open inside the unit or setting it colder than required will both cause issues like the ones you've got. Also, be sure all air vents inside the unit are unblocked and the door closes tightly all around.