If the computer is new return it. If not and you have tried a fresh battery on the sending unit and mounting the sending unit as high as possible on the fork, there's really nothing else to try. Check warranty.
I’m happy to help further over the phone at https://www.6ya.com/expert/donald_f2ed37026a3ac881
SOURCE: Hi, My sigma bc 1009 sts
Well, it IS wireless. Perhaps the distance or line-of-sight isn't right. As a test, hold the receiver in your hand and hold it closer to the spinning wheel transmitter.
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