HELP electrolux freezer unlisted error message

Hi!
I have a rather old (but 'till now working perfect) Electrolux C165A freezer. We had an electri cutdown in the apartment and from that on it gives me an error message nowhere listed:
it gives a high tem beep (but doesn't beep continously)
it gives a flash of high temp red light (but it doesn't stay on)
it doesn't give a temperature or a "+" mark but gives two "-" flashing
the freezer starts but stops in a few seconds give the error sign than starts again
super button oesn't start the thing
I defrosted it, cleaned the airways and the moisture whatever, but I have no more idea.
pls help!