Try the following as it may be that you have accidentally switched the MUTE setting ON accidentally. This would mean that you will not be able to adjust the volume settings on the Parent Unit.
Switching Mute ON:
Press and hold the DOWN (-) button on the right hand side of the Parent Unit (not on the touch screen) for at least 2 seconds to MUTE (deactivate) the Sound Transmission.
Switching MUTE OFF
Press and hold the DOWN (-) button on the right hand side of the Parent Unit (not on the touch screen) for at least 2 seconds to reactivate the Sound Transmission.
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