Ninebot Max Error Code 15
"Brake Hall is abnormal, please check the Throttle Switch, Dashboard & related Connections"
Error 15 is caused when the brake hall sensor is reporting a value outside of the expected range.
This can be easily replicated by holding down the brake when starting up the scooter.
In the field, this error can be caused by the magnet coming dislodged inside the brake.
The error can also happen if the 049E hall sensor is blown due to a voltage spike or some other issue.
Check that the brake lever is not stuck by fully pressing it down and then manually pulling it up.
Unscrew the dashboard cover and remove it to confirm that the connector for the brake is still plugged in firmly.
If that does not solve the issue, you may need to disassemble the brake or buy a new one.
The next thing to check is that the magnets within the brake are still in the correct place.
The brake will have to be disassembled to access the magnets.