Please check first whether the fuse (1A inert) is ok.
Then the battery connection of the ZAW-Cool lights. The 3x1.5mm² NYM cable may not exceed 1.5m long and care must be taken to ensure that battery connection 1 is connected to battery 1, battery connection 2 to battery 2 and battery port 3 to battery 3:
If everything is OK, but the error still occurs, disconnect the luminaire completely from the mains supply and reconnect it. If this does not help, the luminaire must be returned.