dalemanuk

might be worth reading this https://www.pedelecs.co.uk/forum/threads/bosch-cx-intermittent-power-loss-error-530-fixed.37086/

I believe that the CX is designed to power lights from a port on the motor. Max output is 18 watts? Best check what power your light requires

Mine was the first one that you identified..... there's no soldering and it's nothing to do with the battery as such. It's simply a replacement connecting cable between the motor and the battery dock/charger socket on the frame.

https://www.pedelecs.co.uk/forum/threads/bosch-cx-intermittent-power-loss-error-530-fixed.37086/

I got it from Wiggle.

Had the same problem last year. I tried GT85 and all the other stuff but no luck Eventually I washed out the lock with brake cleaner, dried it with an airline and then just kept working the key in it whilst tapping it gently with a hammer. It gave in eventually and opened. Plenty of bump key videos on youtube to give you ideas I dismantled it afterwards but couldn't really see anything wrong but I chucked it anyway and got a repalcement

Have you tried tightening the cranks?

Long time lurker on here - I couldn't find much in the way of info to help with my problem so I’m posting this so that others may benefit from my experience – it’s no fun worrying about suffering a power loss 20 miles from home at my age! My 3 year old 6000 miles Cube Reaction recently developed a habit of shutting down at random points in a ride, usually with the display showing a flashing empty power pack, but no error message. It refused to power up again unless I removed the power pack and reinstalled it. Sometimes I made it back home without any further shut downs, and sometimes not. A battery reset didn't solve the problem It did eventually show error 530 which gave me something to go on. “remove and reinstall power pack – if this doesn’t work consult a dealer”. Hmmm, that sounded expensive! Fortunately my partner has a similar bike so I tried her battery on my bike which solved my problem. I also tried my battery on her bike and it worked perfectly! OK, so it had to be something to do with my power pack connecting to my bike. After searching umpteen forums for advice I cleaned all the terminals and adjusted the power pack mountings so that the pack was held as tight as possible but the problem persisted. Next I decided to try swapping out the wiring loom from the power pack to the motor – problem solved! Once I could closely inspect the original socket/terminals I was surprised how badly the terminals had worn and become pitted. In future I’ll mostly charge the power pack on the bike to at least avoid some wear

Long time lurker on here - I couldn't find much in the way of info to help with my problem so I’m posting this so that others may benefit from my experience – it’s no fun worrying about suffering a power loss 20 miles from home at my age! My 3 year old 6000 miles Cube Reaction recently developed a habit of shutting down at random points in a ride, usually with the display showing a flashing empty power pack, but no error message. It refused to power up again unless I removed the power pack and reinstalled it. Sometimes I made it back home without any further shut downs, and sometimes not. A battery reset didn't solve the problem It did eventually show error 530 which gave me something to go on. “remove and reinstall power pack – if this doesn’t work consult a dealer”. Hmmm, that sounded expensive! Fortunately my partner has a similar bike so I tried her battery on my bike which solved my problem. I also tried my battery on her bike and it worked perfectly! OK, so it had to be something to do with my power pack connecting to my bike. After searching umpteen forums for advice I cleaned all the terminals and adjusted the power pack mountings so that the pack was held as tight as possible but the problem persisted. Next I decided to try swapping out the wiring loom from the power pack to the motor – problem solved! Once I could closely inspect the original socket/terminals I was surprised how badly the terminals had worn and become pitted. In future I’ll mostly charge the power pack on the bike to at least avoid some wear

It's a WLS, the same as my partner has. The owner would be wise not to leave the battery on the bike either