Yamaha SR-C20A User Manual page 64

TROUBLESHOOTING > When a problem occurs: Power or overall functionality
The sound bar cannot be controlled with the remote control
l The sound bar is out of the operating range.
Use the remote control within the operating range.
– "Part names of the remote control" (p.13)
l The battery has run out.
Replace the battery with a new one.
– "How to replace the remote control battery" (p.76)
l The remote control sensor of the sound bar is exposed to direct sunlight or strong lighting.
Adjust the lighting angle or reposition the sound bar.
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