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During the day I received the new Controller WK3615YS. Changed it and it worked just fine. Have no idea what caused the failure, but I am glad that it is running. MAybe I order another spare controller just to be save.....Thanks for your help

This is how the display looks like. All LEDs in the upper row flash 6 times and than a short break. These are the LEDs for the different modes ( low, mid high). Only one of them is supposed to be on. I learned from another post that this could be a code from the controller for the Hall sensors...

@sandpingu, regarding the error codes of the control, you seem to have the documentation or a link to it. Could you please send either the docu or the pointer to me. Thanks

I am based in Bavaria and recently bought a Fiido D2 S bike. This is made in China and so it is difficult to obtain detailed information or spare parts. I do have an electrical problem but do not know the cause. I guess it is not the accu or BMS because Light and Horn is working, display shows...