Bosch Nyon BUI350 - Troubleshooting Guide; Error Codes and Solutions

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Troubleshooting
The components of the eBike system are continu-
ously monitored automatically. If a fault is detected,
the corresponding fault code will appear on the on-
board computer.
The drive may also be switched off automatically de-
pending on what type of fault has occurred. You can
continue riding at any time without assistance from
the drive, but you should have your eBike checked
before completing any more journeys.
u Only have repairs performed by a certified bicy-
cle dealer.
Code Cause Corrective measures
410 One or more buttons of the on-board
computer are disabled.
Check whether any buttons are stuck, e.g. as a result of
dirt finding its way in. Clean the buttons if need be.
414 Operating unit connection problem Have the connections checked
418 One or more buttons on the operating
unit are disabled.
Check whether any buttons are stuck, e.g. as a result of
dirt finding its way in. Clean the buttons if need be.
419 Configuration error Restart the system. If the problem persists, contact your
Bosch eBike dealer.
422 Drive unit connection problem Have the connections checked
423 eBike battery connection problem Have the connections checked
424 Communication problem between
components
Have the connections checked
426 Internal time-out error Restart the system. If the problem persists, contact your
Bosch eBike dealer. With this error, it is not possible to
bring up the wheel circumference in the basic settings
menu or to adjust it.
430 Internal battery of the on-board com-
puter is flat (does not apply to
BUI350)
Charge the on-board computer (in the holder or via the
USB port)
431 Software version error Restart the system. If the problem persists, contact your
Bosch eBike dealer.
440 Internal drive unit fault Restart the system. If the problem persists, contact your
Bosch eBike dealer.
450 Internal software error Restart the system. If the problem persists, contact your
Bosch eBike dealer.
460 Error at USB port Remove the cable from the USB port of the on-board com-
puter. If the problem persists, contact your Bosch eBike
dealer.
490 Internal fault of the on-board com-
puter
Have the on-board computer checked
Bosch eBike Systems 1 270 U20 BN2 | (19.05.2020)