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Appliance

Heat Pump error codes

Heat pump fault codes, including defrost and reversing valve faults.

59 codes indexed

Pick your brand, then your model family

59 codes across 1 model families. The model family matters, because two heat pump models from the same brand can read the same number as two different faults.

Daikin

59 codes

Daikin furnaces use Goodman control platforms, so Goodman model families apply. Daikin VRV IV heat pumps and Daikin mini split and thermostat codes are entirely separate systems with their own code tables.

VRV IV RXTQ-TA / RXTQ-TB

59 codes

The RXTQ outdoor unit serves VRV indoor units over a shared communication bus, and the factory splits the code list by which unit reports it. A and C codes come from indoor units, E, F, H, J, L and P from the outdoor unit, and U and M are system or centralized controller faults. This is a commercial and light commercial multi split platform, not a residential one indoor mini split unit.

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

Matching equipment, 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.

Fujitsu ASTG09 / ASTG12 / AOTG09 / AOTG12 KMTC

24 codes · under Mini Split

These AIRSTAGE units heat as well as cool: the service reference gives a rated heating capacity of 3.2 kW on the ASTG09KMTC and 4.1 kW on the ASTG12KMTC alongside the cooling figures, and the outdoor refrigerant circuit contains a four way valve to reverse the flow. Most of the outdoor codes on this page are compressor, condenser, refrigerant and reversing valve faults, which is the heating half of the same machine. The codes are published once here rather than twice, and this link is here so the heat pump readers reach the right table.

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 MSZ / MSY / MUZ / MUY GL NA series

15 codes · under Mini Split

The MUY outdoor unit in this series is the heating version and the MUZ is cooling only, so the heating half of the same platform is filed as a heat pump. The outdoor codes on this page are mostly compressor, condenser and refrigerant faults, which is where the heat pump side of the equipment lives. The codes are published once here rather than twice, and this link is here so the heat pump readers reach the right table.

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