Genuine Daikin 154255J Infrared Receiver Unit Assembly is the part in the indoor unit that receives the signal from the handheld remote, so the unit responds when you press a button. When it fails, the unit may stop responding to the remote, respond intermittently, or miss commands. A genuine receiver picks up the remote the way your Daikin expects, keeping it responsive — where a non-genuine part can miss signals or respond unreliably.