Air conditioner and control method thereof

An air conditioner, comprising:

• an indoor controller, comprising circuitry, configured to receive an operation command and generate a plurality of first signals corresponding to the operation command;
• a main controller, comprising circuitry, configured to receive the plurality of first signals from the indoor controller, and combine the plurality of first signals to convert the combined first signals into a single second signal;
• an outdoor unit configured to operate based on the single second signal received from the main controller, and generate a third signal corresponding to an operation state of the outdoor unit;
• and
• an indoor unit connected to the main controller and including an indoor fan,
• wherein the main controller is configured to control the indoor fan based on the plurality of first signals and the third signal.