On blomberg freezer FNT9680 X I have a persistent E9 blinking sign. what does it mean? how can I cancel it? the freezer is working.

Try disconnecting the mains power to reset the Control Board.

what did tech say was problem --closed loop doesnt mean anything ---get a second appenion

What is the fridge doing, is it not cooling what?

Error Code E9 ' Appliance Video

www.appliancevideo.com/repair-help/question/error-code-e9

The unit keeps getting a low water error and everything I could think of checks out: inlet valves, w. ... Error Code E9 ' Appliance Video .... Ice on bottom of freezer

Answer may be in the manual https://www.blombergappliances.com/user-manuals

Under normal operating conditions, the internal
temperature of the freezer will ensure the longterm
conservation of the stored food.
When such temperature rises above a certain
level (-12 °C), the appliance will trigger an
acoustic and light alarm. The light alarm is a
blink red light (Red Alarm Indicator Light), while
the acoustic alarm is an intermittent sound.
You can stop the acoustic alarm by pressing
the Acoustic Signal Stop Switch once.
When switching on the freezer for the first
time, the Red Alarm Indicator Light will
blink until the internal temperature has reached
a level required for the safe conservation of frozen
food.

Dado

The start button is flashing and quick wash button is on but time delay stuck on 51 sec

F1-E9 - Stack Overflow.

1. Disconnect power for at least 30 seconds.
2. Re-apply power and observe for at least one minute.
3. If code re-appears, replace control board (also called ERC or clock).

Note: Applies to all F1-E... codes except F1-E3.

http://www.frigidaire.com/manuals
go to this web site. It has lots of manuals. I found several for your unit. just enter you model number and it shows up with several choices.
Hope this is what you are looking for.