You may not be close enough to the Voltas AC unit if you point the remote control at it and press a button without getting a response.   A minimum remote sensor distance of 20 feet is required by some models. Retry the order when you get closer to the unit.   If there is any furniture in front of the unit or the unit interface, it should be moved out of the way. The remote control sensor, which is located at the tip of the device, must have a clear path to the sensor on the unit's interface.   Examine the sensors on the remote control as well as the air conditioner. If the sensors are covered in dirt or filth, the signal from the remote control may not be received. Using a damp towel, wipe the sensors clean.

• If new batteries do not work with the remote control, they may have been put incorrectly. The "+" and "-" symbols, as well as a possible outline of the battery, are engraved or embossed on the inside of the battery chamber on the back of the remote control.

  If the batteries are correctly connected but the Voltas AC still refuses to accept commands from the remote control, dirt or a blockage may be preventing the remote control from working properly.   Remove the batteries from the chamber and examine the metal connections on the battery contacts. If you find dirt on your contacts, use a cotton swab dipped in isopropyl alcohol to clean them. Remove any dirt that has accumulated on the batteries as well.  

• A faulty LED light on the remote control's tip could be the source of a remote control problem. The sensor on the Voltas AC unit's interface receives command signals from the LED light.

  The LED within the remote control may detach from other internal components if it falls to the ground. An infrared sensor card can be used to see if the remote control transmits a correct signal from the LED.   If the card does not respond to remote control commands, the LED is broken, and the remote control should be replaced or repaired.