Night Owl WNVRC20 Series User Manual page 80

Error
The image on the NVR appears,
but does not have sound.
A "whirring" noise is coming
from the system.
The system beeps at startup.
The system beeps during motion
detection.
Possible Causes
Audio cables are loose or have
been disconnected.
Audio channels are disable.
Volume on external speakers
(not included) is low or off.
Fan is active.
Motion detection is enabled and
the alarm is activated.
80
Solutions
Check the AUDIO connection to
the NVR.
Right click in Live View and
ensure Volume is enabled.
Increase volume on external
speakers (not included).
The noise means the exhaust fan
is working normal.
The beep at startup is normal.
Go to the General Menu > Video
Alarm, select the channel and
turn Audible Warning to off.