SH2 means sensor number 2 is shorted
The sensor 2 is shorted.
Heen you open up the casing where the display is on you see a (in my case) purple and grey wire with a black and white wire inside which are attached to the board of the display.
The combination most on the richt is sensor 1, and the other one wires are of sensor 2.
Sensor 2 is a temperature sensor for the defrost unit which I don’t use so I replaced it with a resistor of 15k ohm. That did the trick, you can also replace the sensor of course.
See my result at the picture
I found out the 15k ohms by measuring the other sensor which gave 11,5k ohm at 21 degrees C.
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