Thank You for Your answer.
I removed the SD Card and typed the stated commands.
Firmware Version is ”ThermIQ2 Link v4.35 0096”
”atr0010” just gives me 10 lines with ”.” and then ”TO”.
The ThermIQ card is plugged into the heatpump, on the output of the ThermIQ a Thermia Board called ”Alarm” is connected”, after that the Thermia Online board is then connected (is working properly)
L2 is slowly blinking, Status is blinking 5 times.
I restarted the heatpump and even tried to insert the ThermIQ board after the ”Alarm” board and before the Thermia online board. No change.