It happens to me yesterday check your 5amp fuse remove and check if it is blown just replaced it should solve your problem.

I called the Rad Power toll free number this morning to complain about my battery charger that is getting really hot scared I can burn down my house on my Ras Runner plus and the lady said battery charger are not any way covered with warranty. My ebike is little over a year old purchased June 2021. Good luck guys I will never buy any Rad Power e-bikes  I dont recommend this bike bike. Bad support.

Hello 8/28/22 Sunday I pry open the fuse cover by a tiny screwdriver and check the 5amp fuse and its busted pulled it out replace with working fuse beoawalla now its charging again.
Problem solve thanks for this forum guys thank you a quick fix on my Rad Runner Plus battery that will not charge after taking it for ride this morning.

Gerry