How to remove a broken saved channel
If ZNC keeps trying to join a channel that fails, remove the saved channel from the current network context.
List saved channels:
/msg *status ListChans
Remove a channel:
/msg *status DelChan #channel
Then reconnect if needed:
/msg *status Disconnect
/msg *status Connect
or:
/msg *status Jump
Be careful with network context
These commands apply to the current ZNC network context. Make sure your client is connected to the right username/Network context before deleting saved channels.
Why removal helps
If a channel is invite-only, banned, registered-only, or no longer exists, ZNC may repeatedly fail to join it. Removing it stops the repeated attempts.
When not to remove it
Do not remove a channel if you only need a temporary reconnect, NickServ login, or invite. Fix the actual reason first if you still want the channel.