The Hornets were accused of failing to ensure their players conducted themselves in an orderly fashion and/or refrained from provocative behaviour against Ipswich on December 21.
Several Hornets players surrounded referee Graham Scott after he judged that Frank Nouble's cross had been handled in the penalty area by defender Gabriele Angella, with Joel Ekstrand booked for his protests.
The FA confirmed the punishment on its website on Tuesday afternoon.
- Sports & Recreation
- Frank Nouble
- Gabriele Angella