What to do if no receiving tone sounds from the indoor unit of Sinclair SDV4?
- KKyle BrownSep 13, 2025
If no receiving tone sounds from the indoor unit even when the ON/OFF button is pressed, check whether the signal transmitter of the remote controller is properly directed to the infrared signal receiver of the indoor unit when the ON/OFF button is pressed. Directly transmit the signal transmitter of the remote controller to the infrared signal receiver of the indoor unit, and then repeatly push the ON/OFF button twice.