Error Code Battery LED light does not flash when holding for 7 seconds

The battery type selection function does not activate upon pressing the gray button.

? What Causes This

Battery selection feature is disabled and needs to be reenabled via controller reset procedure.

Disconnect the battery from the charge controller completely.
Reconnect the battery properly and securely.
Hold the grey button for 7 seconds, release, then immediately press again to select a new battery type if required. Ensure correct operation within specified wait time.

Source: page 25 of the official manual

From the manual

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