How do I activate the Silence function on the Ambra Remote Controller?
Hold down the Fan button for 2 seconds to activate or deactivate the Silence function. Due to low frequency operation of the compressor, this may result in insufficient cooling and heating capacity. Press ON/OFF, Mode, Sleep, Turbo, or Clean button during operation to cancel the Silence function.
From the official Ferroli Ambra Remote Controller manual, page 12
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