Sony MHC-V42D Help Manual page 6

Pairing cannot be performed.
The BLUETOOTH device cannot detect the system, or [BT OFF] appears on the display.
Connection is not possible.
iPhone/iPod cannot be connected with the system.
The sound skips or fluctuates, or the connection is lost.
The sound of your BLUETOOTH device cannot be heard on this system.
There is severe hum, noise, or distorted sound.
Apps Control
Voice Control does not work properly.
Control for HDMI ("BRAVIA")
The system does not turn on even when the TV is turned on.
The system turns off when the TV is turned off.
The system does not turn off even when the TV is turned off.
There is no picture/sound when connected to the HDMI OUT (TV) ARC jack.
No TV sound is heard from the system. [CODE 01] and [SGNL ERR] appear on the display.
No TV sound is output from the system.
The sound is output from both the system and the TV.
The Control for HDMI function does not work properly.
Gesture Control
The Gesture Control cannot be activated.
The Gesture Control does not operate properly.
Multiple systems playback
Wired Party Chain function cannot be activated.
[PARTY CHAIN] is flashing on the display.
Wired Party Chain function does not work properly.
BLUETOOTH device cannot be connected to the system during Wireless Party Chain function.
BLUETOOTH device cannot be connected to the system during Speaker Add function.
Karaoke
There is no microphone sound.
There is acoustic feedback.
6