Common Daikin Air Conditioning Fault Codes A1 - Micro-computer in PCB is not working - this is a fault that occurs either in the assembly of the PCB or due to an external factor, such as noise. A3 - Drain level is too high - This is caused by a clogging of dirt in the drain, or a faulty drain pump. fault Malfunction of AC input current sensor system Malfunction of suction air thermistor Malfunction of discharge air thermistor Malfunction of humidity sensor system Malfunction of switch box thermistor Malfunction of high pressure switch Malfunction of thermostat sensor in remote controller Protection devices activated (unified) Malfunction Daikin fault codes are a vital diagnostic tool for identifying system errors in Daikin air conditioning systems. These alphanumeric codes provide technicians with valuable information to pinpoint and rectify issues quickly, ensuring efficient and reliable operation of the equipment. system code meaning; 00: normal: ua: indoor-outdoor unit combination fault: u0: refrigerant shortage: u2: drop voltage or main circuit overvoltage: u4: failure of transmission (between indoor unit and outdoor unit) i have been asked today to have a look at a daikin cassette in a pub that has a fault. i have'nt had much to do with these units so please bear with me. first fault is communication code u4 from what i can read into the wiring diagram i think this would be wire 3 to the outdoor unit. Climate Talk Fault Code Dealer error message Blower motor not running Blower communication error Blower motor HP mismatch Blower motor is operating in a power, temperature, or speed limiting condition Blower motor is operating in a power, temperature, or speed limiting condition Blower motor current trip or lost rotor position Rb0JE.

daikin cassette fault codes