Buzzer is beeping continuously even after boot-up on OmnibusF7V2

Hi all,
Buzzer on my OmnibusF7V2 running latest daily build arducopter is buzzing continuously even after booting up.Its connected to Buz+ and buz- pads of the board.Please help.Thanks.

Have you set battery low alarms?
Is the ‘model finder’ channel set high?

No i haven’t set any low battery alarm and i don’t have any model finder setup.All default parameters.