Sony HDR-CX440 How To Use Manual page 179

Disconnect all USB devices from the USB jack of your computer except the
keyboard, mouse, and this product.
[236] Troubleshooting
display/Warning indicators
Self-diagnosis display
If indicators appear on the LCD monitor, check the following. If the problem
persists even after you have tried to fix a couple of times, contact your Sony
dealer or local authorized Sony service facility. In this case, when you contact
them, give them all the numbers of the error code beginning with C or E.
You may hear a melody when an important warning indicator appears on the LCD
monitor.
C:(or E:)
C:04:
You are not using the designated battery pack. Make sure to use the designated
battery pack.
Connect the AC Adaptor and the USB cable firmly.
C:06:
The battery pack temperature is high. Change the battery pack or place it in a cool
place.
C:13: / C:32:
Remove the power source. Reconnect it and operate this product again.
E: :
Follow the steps from 2 on "If you have problems."
(Battery level warning)
The battery pack is nearly used up.
Self-diagnosis display/Warning indicators
: (Self-diagnosis display)
Self-diagnosis