Sorry to reopen this old thread, but I have an uncommon scenario regarding ERROR 30 and need your help in order to pinpoint the faulty component.
So, I have two Bafang BBSHD kits with the following configuration:
Bike 1: BBSHD / DCP-18 display / Hailong 48V 17.5 Ah battery
Bike 2: BBSHD with Egg...