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Appliance

Mini Split error codes

Ductless mini split fault codes for indoor and outdoor units.

39 codes indexed

Pick your brand, then your model family

39 codes across 2 model families. The model family matters, because two mini split models from the same brand can read the same number as two different faults.

Fujitsu

24 codes

ASTG09 / ASTG12 / AOTG09 / AOTG12 KMTC

24 codes

ASTG09KMTC and ASTG12KMTC indoor units with AOTG09KMTC and AOTG12KMTC outdoor units on R32. A compatible non-polar wired controller shows the code directly on its display. The supplied wireless controller has no screen and shows the same codes as a flashing pattern on the indoor indicator lamps instead. The service reference gives a separate main PCB, control unit and inverter assembly identification for each of the two capacities, so a board from the wrong capacity is a recognised cause of codes 32 and 62.

11FujitsuSerial communication error12FujitsuWired remote controller or server room control communication error15FujitsuCheck run unfinished or automatic airflow adjustment error18FujitsuExternal communication error23FujitsuCombination error32FujitsuIndoor unit PCB model information error35FujitsuManual auto switch error41FujitsuRoom temperature sensor error42FujitsuIndoor heat exchanger middle temperature sensor error44FujitsuHuman sensor error51FujitsuIndoor unit fan motor error62FujitsuOutdoor unit main PCB model information or communication error63FujitsuInverter error64FujitsuActive filter or power factor correction circuit error65FujitsuTrip terminal L error71FujitsuDischarge temperature sensor error73FujitsuOutdoor heat exchanger liquid temperature sensor error74FujitsuOutdoor temperature sensor error84FujitsuCurrent sensor error94FujitsuTrip detection95FujitsuCompressor rotor position detection error97FujitsuOutdoor unit fan motor 1 error99FujitsuFour way valve errorA1FujitsuDischarge temperature error, compressor over-temperature

Mitsubishi Electric

15 codes

Mitsubishi Electric splits its equipment across several unrelated control platforms, and the same lamp pattern means different things on each one, so the codes are published per model family rather than for the brand as a whole. The GL series is R410A.

MSZ / MSY / MUZ / MUY GL NA series

15 codes

MSZ and MSY indoor units with MUZ cooling only and MUY heating outdoor units on R410A. There is no numeric display: you count blinks of the upper operation indicator lamp on the indoor unit. The same blink count can mean an indoor fault or an outdoor one, and a three second steady hold before the blinking with no beep is what tells the two apart, with a second LED inside the outdoor unit narrowing several outdoor codes to one part.

Lamp offMitsubishi ElectricNot a faultNo blinking, normal operation1 blink, 2.5 s OFFMitsubishi ElectricRoom temperature thermistor, or indoor outdoor communication error2 blinks, 2.5 s OFFMitsubishi ElectricIndoor coil thermistor, or outdoor power system3 blinks, 2.5 s OFFMitsubishi ElectricSerial signal, or one of six outdoor thermistors4 blinks, 2.5 s OFFMitsubishi ElectricOvercurrent, or compressor startup failure5 blinks, 2.5 s OFFMitsubishi ElectricDischarge over-temperature, compressor stopped6 blinks, 2.5 s OFFMitsubishi ElectricHigh pressure protection7 blinks, 2.5 s OFFMitsubishi ElectricInverter or control board over-temperature8 blinks, 2.5 s OFFMitsubishi ElectricOutdoor fan motor9 blinks, 2.5 s OFFMitsubishi ElectricControl board memory, or a shorted power module10 blinks, 2.5 s OFFMitsubishi ElectricDischarge temperature too low, starved compressor11 blinks, 2.5 s OFFMitsubishi ElectricIndoor fan motor, or outdoor bus voltage and phase current12 blinks, 2.5 s OFFMitsubishi ElectricIndoor control board memory14 blinks, 2.5 s OFFMitsubishi ElectricClosed stop valve, or four way valve and pipe temperature16 blinks, 2.5 s OFFMitsubishi ElectricRefrigerant system abnormality, closed valve or air trapped

The matching equipment is published under its own hub

You are in the right place to start, but these codes belong to a different kind of equipment, so we publish them there rather than republishing the same table twice. Follow the link and you are on the canonical page for your unit.

Daikin VRV IV RXTQ-TA / RXTQ-TB

59 codes · under Heat Pump

A VRV IV heat pump is a multi split system, so it is the equipment people usually mean when they search mini split error codes, and the same inverter, communication and refrigerant faults are what they are searching for. The codes are published once under Heat Pump rather than twice, and this link is here so you can reach the right table without being sent to an empty page.

A0DaikinIndoor unit external protection device abnormalityA1DaikinIndoor unit control board abnormalityA3DaikinDrain level control system abnormalityA6DaikinIndoor fan motor lock or overloadA7DaikinSwing flap motor abnormality, warningA8DaikinIndoor unit power supply voltage abnormalityA9DaikinIndoor unit electronic expansion valve abnormalityAFDaikinDrain water level above the limit, warningAHDaikinSelf cleaning decoration panel abnormalityAJDaikinCapacity setting errorC1DaikinTransmission abnormality between the indoor and fan boardsC4DaikinIndoor heat exchanger liquid pipe thermistor abnormalityC5DaikinIndoor heat exchanger gas pipe thermistor abnormalityC6DaikinIndoor unit and fan board combination errorC9DaikinSuction air thermistor abnormalityCADaikinDischarge air thermistor abnormalityCCDaikinHumidity sensor system abnormality, warningCEDaikinInfrared presence or floor sensor error, warningCJDaikinRemote controller thermistor abnormality, warningE1DaikinOutdoor unit main board abnormalityE3DaikinHigh pressure switch activationE4DaikinLow pressure protection activationE5DaikinCompressor motor lockE7DaikinOutdoor fan motor abnormalityE9DaikinOutdoor electronic expansion valve abnormalityF3DaikinDischarge pipe temperature abnormalityF6DaikinRefrigerant overchargeH9DaikinOutdoor air thermistor abnormality, R1TJ3DaikinDischarge pipe thermistor abnormality, R2TJ5DaikinSuction pipe thermistor abnormality, R3T and R5TJ6DaikinOutdoor heat exchanger deicer thermistor abnormality, R4TJ7DaikinOutdoor heat exchanger liquid pipe thermistor abnormality, R7TJ9DaikinSubcooling heat exchanger gas pipe thermistor abnormality, R6TJADaikinHigh pressure sensor abnormalityJCDaikinLow pressure sensor abnormalityL1DaikinInverter board abnormalityL4DaikinRadiation fin temperature rise abnormalityL5DaikinCompressor instantaneous overcurrentL8DaikinCompressor overcurrentL9DaikinCompressor startup abnormalityLCDaikinTransmission error between the outdoor board microcomputersM1DaikinCentralized controller board defectM8DaikinTransmission error between centralized controllersMADaikinPoor centralized controller combinationMCDaikinAddress duplication and poor setting, warningP1DaikinInverter circuit capacitor high voltageP4DaikinRadiation fin thermistor abnormality, warningU0DaikinRefrigerant shortage, warning that should not be ignoredU2DaikinPower supply insufficient or instantaneous abnormalityU3DaikinCheck operation not executedU4DaikinTransmission error between indoor and outdoor unitsU5DaikinTransmission error between the controller and the indoor unitU8DaikinTransmission error between main and sub controllersU9DaikinTransmission error within the same systemUADaikinImproper indoor and outdoor unit combinationUCDaikinCentralized controller address duplication, warningUEDaikinTransmission error between the centralized controller and an indoor unitUFDaikinSystem not set yetUHDaikinSystem address undefined