I had a similar problem , the bike was a day old.. at least it gave me a code on the display. In the end the resolution was to replace the controller. It seems these parts are not very durable.... Maybe find a repair shop in your area that may be able to fix or replace the controller ?

Update on the Control Unit. I did receive the new one over the weekend and installed it, which in itself was not easy as you need hands the size of a toddler's and be able to see around corners. But it's in and the bike is now working as intended.
Now with the faulty Controller, i would like to see if it can be fixed. Has anyone attempted this with success ?

i was looking into the same. Our dog is around 20 pounds and most carriers i could find does not allow anything that heavy, so i will experiment with a milk crate bolted to the rear carrier, after all its just a box for the pooch to sit in... maybe add some soft foam to make it more comfortable
we did try a small trailer (the kind for small kids) behind our normal bicycle but she did not like it and wanted to jump out constantly..

So, After a brief 9 mile ride, my 2 day old Rad Rover 6+ decided to have an error 21 code on the display. I went through the on-line support and did all the checks suggested on the site, but had no luck in restoring the bike into a workable state.

I did contact support subsequently and they ordered a new controller for my Bike under warranty, which is expected and the service was really prompt.

So now waiting for the controller (it has not been shipped as we speak) i was hoping some folks may have insights on what will cause the error and if there is a fix which does not involve replacing the controller, i.e. can it be reset in some way to clear the error or is the controller a throw away part. Obviously having had the bike for 2 days and only had one ride on it i am quite disappointed. I truly hope this is a once-off occurrence.


Any insights would be appreciated...