What should I do if the air conditioner does not respond to the remote controller?

Check whether curtains, doors, or other materials are blocking the signals from the remote controller to the indoor unit, as the air conditioner will not operate if signals are obstructed. Also verify that the infrared signal receiver on the indoor unit is not exposed to direct sunlight, which can prevent proper functioning — use curtains if necessary. If other electrical appliances react to the remote controller, move those appliances or consult your local dealer. (Page 8)