WHM show the service as down.

Server domain.com
Primary IP Address 69.xx.xx.xx
Service Name ftpd
Service Status failed
Notification The service ?ftpd? appears to be down.
Service Check Method The system?s command to check or to restart this service failed.
Number of Restart Attempts 258
Startup Log 

Do the following…

# cd /var/run
# mv pure-ftpd.pid pure-ftpd.pid.bk

Restart ftpd in WHM under Service