Rad Power Bikes Radster, RadWagon 5 and RadExpand 5 Plus: error 30 on the color display

Your Radster Road, Radster Trail, RadWagon 5 or RadExpand 5 Plus shows error 30 on the color display, or won't power on. Rad's Color Display error code table defines error 30 as a communication error between controller and display, caused by a loose connector, a damaged cable or a faulty controller, and sends you to the connector check guide for your model. The short answer: reseat the front harness plugs first, then the plugs at the controller.

Most likely cause

A connector that has loosened, or picked up water or dirt, at either end of the data path. All three guides check the same six plugs on the front wiring harness, in front of the handlebar: front brake sensor, rear brake sensor, throttle, color display, remote and headlight. Then they move to the controller plugs: battery, wiring harness, pedal assist (not listed on the Radster), motor and taillight. (Radster, RadWagon 5, RadExpand 5 Plus)

Other causes to rule out

• Damaged, dirty or wet battery or mount contacts. (Rad)
• A damaged cable or faulty controller. (Rad code table)
• A remote button stuck at power on shows as error 34, not 30. (Rad code table)

How to confirm

1. Remove the battery, drain power, and inspect the battery and mount contacts.
2. Photograph the cable routing before you start.
3. Front harness: unplug, inspect and reconnect the brake sensor, throttle, display, remote and headlight plugs one at a time. On the RadExpand 5 Plus you may need to remove the harness cover first. Power on after each.
4. Controller plugs, which sit in a different place on each model:

• Radster: at the bottom of the down tube. Remove the controller's rear mounting bolts and pull it out. Rad says to tighten those bolts to 2 to 3 Nm when you refit it. (Rad)
• RadWagon 5: inside the frame opening behind the battery tray. Remove the three tray bolts with a 4 mm hex key, and Rad gives 5 Nm for them on refit. (Rad)
• RadExpand 5 Plus: on the back of the seat tube, with cables running into the down tube under a rubber grommet you pry off. (Rad)

1. The motor plug is on the chain stay. On the Radster and RadWagon 5 it screws together, so unscrew it before pulling it apart.
2. At every plug, look for damage, dirt or moisture, line up the pins and arrows, and press straight together.

Fix options

Reseat the connectors (easy to moderate)

The front harness is easy. Reaching the controller takes basic tools and care. Rad lists hex keys, a torque wrench, flat side cutters and zip ties, with a flathead screwdriver for the RadExpand 5 Plus.

Replace a damaged part (moderate, with Rad support)

If a plug is damaged, dirty or wet, Rad says the part may need replacing. Photograph it and contact support.

Controller diagnosis (pro)

If every plug checks out, leave the controller and display to Rad or a shop.

Parts

• Zip ties
• Replacement cable or component, only as Rad support directs

When to get a pro

Get help for any damaged or wet connector, or if error 30 survives the full check. Reroute cables as your photos show, trim zip ties flush, and make sure the handlebar turns freely. See inspect and clean connectors, error 24 on the color display and Rad Power Bikes error codes.

Sources

• Color Display error code table, support.radpowerbikes.com
• Radster, support.radpowerbikes.com
• RadWagon 5, support.radpowerbikes.com
• RadExpand 5 Plus, support.radpowerbikes.com

Stuck after these checks? Find a shop near you.