Resetting a victron 100/50 mppt controller

Hi everybody just after some advise as I’m new to this. Just wondering how to either reset my controller or set it to get rid of the error code of in the battery lie it says charger off . How do I get it to come back on? I have tried a few things but can’t work it out,can someone avise me how to get it to turn on please

In the app - tap the message with the error code - what is the reason for the charge controller being off?

The controller will be off if it’s dark or you have no panels connected. Blue light should flash every 5 seconds or so. If it’s an actual fault it should have a little orang exclamation mark or a message saying what the exact issue is. Charger will stay off until you rectify the problem such as “PV overvoltage” if there’s no mention of a fault, your panels are either not connected, it’s night time, or you have a fried connection in a panel or in the wiring between panel and controller.