If you are having issues connecting to the battery monitor, please follow these steps:
Delete the device from your bluetooth devices list and add it again from the Victron app. Do not add Victron devices directly from the bluetooth menu on your phone!
If that does not work, delete and reinstall the Victron app on your phone.
If you have forgotten your password, please perform the following steps:
Unscrew your control panel from the wall of your van
Write down the PUK code on the back of the battery monitor
On the device list of the main screen of the Victron Connect app: tap or click the three-dots menu on the right side of the product description. A menu will pop up offering a 'Reset PIN code' option. Click that, and enter the PUK code.