What does errorcode 406 mean?

Errorcode:
406

Error message on display:

No communication with vehicle.
Please check your charging cable.

Possible Cause:
Monitored CP voltage level is out of range according to the IEC 61851 norm.

Possible solutions:

One specific cable, Issues with other charge points: Cable broken.
All cables, No issue with other charge points; Contact the service department of your charge point supplier.

OCPP Statusnotification:
Info field: CP value out of range actual: -9.8V / -12V.
OCPP 1.5: Mode3Error
OCPP 1.6/2.0.1: Communication Error

Suggestions:

Service