Rad Power Bikes Radster, RadWagon 5 and RadExpand 5 Plus: error codes

This page covers the Rad Power Bikes models with the color display: the Radster Road, Radster Trail, RadWagon 5 and RadExpand 5 Plus. When the controller finds a fault, the color display shows the code as a number. The list below is Rad's own table for these four bikes (Rad color display error codes). Write the number down or take a photo before you switch anything off.

Codes

• Error 6: battery undervoltage, the pack is below the voltage the bike needs, usually because it is nearly empty. Charge it fully.
• Error 10: battery overvoltage, the pack is outside its voltage limits, which Rad says can happen with a non Rad battery or a controller problem. Restart and use only a Rad approved battery.
• Error 12: motor stall warning, the throttle is on but the motor isn't turning, for example light throttle on a steep hill or throttle with the brakes on. Restart, and don't hold the throttle against the brakes.
• Error 15: torque sensor error. Rad's first check is the torque sensor plug at the controller, looking for damage or moisture.
• Error 16: controller error. Restart; if it stays, a connector check finds the part at fault.
• Error 17: throttle held while the bike powered on. Let go of the throttle and power on again.
• Error 21: abnormal motor current, so the controller shut the bike down. Let the motor cool. What to check
• Error 22: throttle fault, often damage or moisture in the throttle plug or cable. Unplug the front throttle connector and inspect it.
• Error 23: motor phase fault, often heat from long climbs, sometimes the controller. Let it cool, and contact Rad if it shows on flat ground. What to check
• Error 24: motor hall fault, a lost connection between motor and controller. What to check
• Error 25: a brake lever was held while the bike powered on. Release both levers and power on again.
• Error 30: the controller and display aren't talking, from a loose plug, a damaged cable or the controller. What to check
• Error 34: a remote button was held or is stuck at power on. Let go once the bike starts, and free any stuck button.

Before you call a shop

• Restart the bike with nothing pressed: no throttle, no brake lever, no remote button. Codes 17, 25 and 34 come from exactly that (Rad).
• Charge the battery fully and use only a Rad approved battery and charger.
• After a long climb, switch off and let the motor rest before you ride again.
• Before unplugging anything, power off, remove the battery and drain leftover power with the power button, then pull each plug straight apart and push it back with the arrows lined up (Rad error 24 guide).
• If a plug looks wet, dirty or damaged, photograph it and contact Rad support rather than cleaning or repairing it (Rad error 22 guide).

More help

• Rad Power Bikes troubleshooting, the brand hub.
• Rad Power Bikes error codes for every Rad display.
• Throttle not working and motor cuts out.
• Inspect and clean connectors.

Sources

• Rad color display error codes, support.radpowerbikes.com
• Rad error 24 guide, support.radpowerbikes.com
• Rad error 22 guide, support.radpowerbikes.com

Stuck after these checks? Find a shop near you.