1. Are all the lights on the throttle on? Do they stay on when you try to use the throttle? if you answered yes to both questions then proceed to step 2. if you answered no to either question then check the voltage on your battery using a multimeter and determine (or ask) if it is an appropriate voltage for your motor.
2. Turn off the battery, unplug the brake levers, control buttons, and display or bluetooth dongle. The only thing that should remain connected is the throttle. Now turn the battery back on. If the throttle works, turn off the battery and then plug each disconnected item in one at a time, power up again and try the throttle to determine which one is causing the issue. If the throttle still doesn't work, proceed to step 3.
3. Leave the controller plugged into the motor but unscrew it, pull it out and flip it over, leaving it hanging. There should be a red light on the inside of the controller, check how many times it blinks consecutively. This indicates an error code. It should blink once when the battery is turned on, if it blinks more than once there is an error.
Let me know the results of your tests.
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Please follow the general troubleshooting steps at the top of this article:
https://goldenmotor.bike/support/instructions/troubleshooting-internal-hub-kits/
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