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If you Google "error 71 Yamaha" there is info about a fix for Lapierre bikes with Yamaha batteries that involves a small disc that raises the connector on the battery being fitted. This may help.

Ours is only 6 weeks old, Sduro Hardseven 1.5, so I will be looking for a refund judging by your problems. Cheers for the info.

Hi, thanks for info . I have a Bosch Cube bike,done over 3,000 miles without a problem. Seems like may be a fault. Have read somewhere that there may be a bad connection with battery to terminal ?

Hi, I just got a Haibike 1.5 for my wife. Plugged bike in to charge via charge point in frame and day after, error 71 came up. Plug that I used was double socket which has fridge plugged in other socket.! Did the code return for you after initial fault ? Cheers