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Troubleshooting

Rad Power Bikes troubleshooting by symptom

Safe, step by step checks for common Rad Power Bikes problems, from a bike that won't power on to error codes, cutting out, brakes and flats, with links to Rad's official guides.

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

The Pedalwise team started this page from official manuals, support pages and repair videos. Fixed this yourself, or spotted something wrong? Help improve it.

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 walks Rad Power Bikes owners through the most common problems, easiest checks first. It covers the RadRunner, RadWagon, RadCity, RadRover, RadMini, RadExpand, RadTrike and Radster families. Rad's own guides change with the battery type (external, semi-integrated or integrated) and the display, so we point you to the matching official page as we go.

Before you start

Common problems and what to check

Bike won't turn on

  1. Check the charge. Press the battery's charge level button and read the lights. On external batteries the key must be turned on first, per Rad's external battery guide.
  2. Some semi-integrated batteries ship in a deep sleep called ship mode. Rad's semi-integrated guide says to hold the battery button for at least three seconds to wake it.
  3. Remove and reinstall the battery until it seats fully, then look at the battery and mount contacts. If they are dirty, damaged or wet, Rad says not to clean or repair them. Photograph them and contact Rad support.
  4. Check the display connector at the handlebar. Pull it straight apart, look for debris or moisture, and push it back together with the arrows lined up. Never twist it.
  5. Rad's guides go on to connectors inside the downtube and battery fuses. That is the point where we suggest a shop. See also e-bike won't turn on.

Battery won't charge

Error code on the display

Assist or throttle cuts out

  • Charge the battery. Rad lists a low voltage code that can appear near empty.
  • If it cuts out on long climbs, stop and let the motor cool. Rad ties several motor current codes to heavy hill climbing.
  • Make sure a brake lever isn't resting partly pulled, since the brake switch cuts motor power.
  • Rad's error 22 guide shows how to unplug and inspect the throttle connector for moisture or damage.
  • More help: motor cuts out, no pedal assist and throttle not working.

Brakes rub, squeal or feel weak

  • Check the wheel is fully seated and centered in the dropouts, as Rad's mechanical brake guide describes.
  • Spin the wheel and watch the rotor. A bent or dirty rotor reduces braking. Don't touch rotor edges, and keep skin oil off the pads and rotor.
  • New pads take time to bed in. Rad says about 25 to 50 miles.
  • Some models, such as the RadCity 5, RadRover 6 and RadRunner 3 Plus, have hydraulic brakes with a separate guide. Bolt torque values are in your owner's manual. See also e-bike brakes.

Flat tire

  • Remove the battery first. Rad's flat repair article notes this makes the bike safer to flip.
  • On a rear hub motor wheel, take care with the motor cable and the thin brake rotor when the wheel is out.
  • Check inside the tire for the thorn or glass that caused the flat before fitting a new tube.
  • RadWagon 4 owners should check the recall linked above. More in e-bike flat tire.

Bike got wet

  • Rad says to stop using a battery that was submerged or had heavy water exposure and to contact Rad support.
  • Damp mount terminals should air dry completely before the battery goes back in. See e-bike got wet.

Gears skip or the chain clicks

  • Shift through the gears on a stand and listen. Rad's derailleur video below shows the basic adjustment. For other sounds, see e-bike noises.

Videos

Official help

When to get a pro

  • Anything inside the downtube, the controller, the main wiring harness or battery fuses.
  • Bent pins or a connector with moisture, corrosion or melted plastic.
  • Hydraulic brake bleeds, wheel truing and motor problems.
  • Recall repairs, which Rad handles.

Never open the battery or try to repair a damaged battery or connector yourself. Stop, photograph it and take it to a qualified shop or Rad support. Read e-bike battery care and when to call a pro.

Sources

Stuck after these checks? Find a shop near you.

In this section

Need a pro?

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.

Talk

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