Failure of new charger and unable to diagnose

I am English and in the UK. I own a Twizy 2017 imported from Korea with the Nilsen battery installed about 4 years ago by his UK agent. The Twizy failed 2 years ago with the charger malfunction symbol. I installed a new charger from Renault myself. I am 81 and have no electronic or EV experience.
Result is: the charger does nothing when I connect it; in key position 2 the 12v accessories work; the battery shape flashes: there is the written ERROR; there are the 2 horizontal bars; the STOP and SERV lights are illuminated; nothing changes when I turn key to position 3 (normally N).
I have a new dongle from Kenneth. The 12v battery is externally charged fully. The installer here refuses any help. Kenneth sent me a canbus adapter but I have no idea how to use it. He may or maynot visit me in England. ihave failed with an OBD diagnostic reader.
I have 3 chances: 1. someone can sort this out. There seems zero chance I can get this help. 2.I can somehow check if the battery and BMS are good I could use them in an old Working 2012 Twizy with low battery. 3. If anyone from Germany, France wants to come here and take this Twizy for spares/repairs complete I will not ask for payment and will provide UK document.
With many thanks for all the information provided by you people, but despite many hours reading I am defeated. Apolgies I have no German, only Spanish and French. I am located near the famous 'Stonehenge', Wiltshire, England.

Hi.

Welcome to the show!
First, it is very important that "we" find out what error messages are in the error memory.
To do this, however, you need to get an OBD2 dongle up and running, and the corresponding software. We will help you with that.

higoseco schrieb: I installed a new charger from Renault myself.

Please contact Renault to configure the new charger to work with VIN of your Twizy. Shoul help and get the T running...

kloetzle schrieb:

higoseco schrieb: I installed a new charger from Renault myself.

Please contact Renault to configure the new charger to work with VIN of your Twizy. Shoul help and get the T running...

There is no need to configure the new charger. It is plug and play.

I had a similar problem lately. My charger refused to charge and i was thinking of replacing it.
Then I had the idea of checking all the fuses, and the fuse named traction battery 5A was defective.
(the Twizy was still driving)
Fuse replaced and everything is ok

Many thanks. I gave wrong information about what the display shows ( ignition position 3).
It shows: both N symbols flashing; the broken battery symbol; the 2 black bars; and the SERV light illuminated. The battery level 'box' shows fully charged which I believe is true.
I am unable to get any information from the OBD app which only seems to relate to IC engines. I do not know whether the canbus adapter Kenneth sent me could be useful. I do not understand its function

I remember now that after I installed the new charger it charged the battery up a little: 96% to 100%.