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Rad Power Bikes RadRunner 3 Plus and RadTrike (Rad UI): error codes

How the Rad UI remote and display show error codes on the RadRunner 3 Plus and RadTrike, how to read the bars, what each code means, and the first safe check.

Last edited Nov 8, 2026 by Pedalwise team Edit History Add a subpage

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Battery and electrical safety. Lithium-ion batteries can catch fire if they're damaged or charged wrong. Never open a battery pack, and stop using any battery that's swollen, hot, wet or smells burnt. Every edit to this page is checked by a second person before it goes live.

This page covers two bikes with Rad's Rad UI controls: the RadRunner 3 Plus, which has the Rad UI display and remote, and the RadTrike, which has the Rad UI remote. The Rad UI display shows the code as a number. The remote shows a large E and then lights its charge bars: the lower bars give the first digit and the upper bars the second, so two lower bars and three upper bars mean 23 (RadRunner 3 Plus manual, RadTrike codes). A single flashing bar can mean error 30 rather than a low battery, so check the battery's own charge indicator.

A code that points at the motor, controller, wiring or battery is an electrical fault. Do only the plug checks on this page, with the bike off and the battery removed, and leave opening the motor, controller or battery, soldering or rewiring to a pro or the maker's support. See battery won't charge and when to call a pro.

Codes

  • Error 21: abnormal current between the battery and controller. Power cycle the bike first (RadTrike codes).
  • Error 22: throttle fault. Rad's EU manual for the RadRunner 3 Plus calls the throttle the twist power assist (RadRunner 3 Plus manual).
  • Error 23: motor phase fault, a problem with the motor phase wires.
  • Error 24: motor hall fault, which Rad's RadTrike page ties to the motor connector (RadTrike codes).
  • Error 25: brake switch fault, or a brake applied while turning on. Release the brake and power on again.
  • Error 30: communication fault somewhere on the bike. What to check on a RadRunner 3 Plus, what to check on a RadTrike
  • Error 31: power button fault, usually from holding the button more than about six seconds or a stuck button. Let go as soon as the display and remote light up (Rad error 31).
  • Error 34: walk mode disengage fault. Rad lists this one for the RadRunner 3 Plus only (RadRunner 3 Plus manual).

Before you call a shop

  • Stop riding when a code appears, note it or take a photo, then turn the bike off and on with nothing pressed (RadRunner 3 Plus manual).
  • If the remote's power button feels stuck, power down and free it gently, then photograph the remote and display for Rad support if error 31 stays (Rad error 31).
  • For error 30, follow Rad's connector check guide for your model, powered off with the battery removed.
  • Look up any code that stays at Rad's help center or contact Rad support with your photos.

More help

Sources

Stuck after these checks? Find a shop near you.

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If these steps didn't fix it, find a shop near you in our partner network. For battery or wiring trouble, look for shops marked Battery and electrical.

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