Mini Split Error Code List and Meanings

By | January 26, 2022
21 Comments

Mini Split Error Code List

  • Pioneer Error Codes and Meanings
  • Carrier Error Codes and Meanings
  • Cooper and Hunter Error Codes and Meanings
  • Daikin Error Codes and Meanings

    • Mini split units are nice to have and usually very reliable heating and cooling units.

    Unfortunately, errors can happen, which is usually displayed on the indoor wall unit.

    This error can be looked up in a manual to see what the meaning is.

    For example, an E1 error code on a Pioneer Mini Split means there is a problem with the Indoor/Outdoor unit’s communication.
    Mini Split Error Code List and Meanings
    Often error codes can be manufacturer-specific, and sometimes, different models can have different errors codes.

    The best way to troubleshoot any code is to have the manual for your unit.

    Sometimes finding a manual can be difficult, so here we list the known error codes for big-name mini split manufacturers.

    Keep in mind that there may be differences between models, but most of the codes should match.
     
    Pioneer Mini Split Error Codes and Meanings

    DisplayStatus
    E0Indoor unit EEPROM parameter error
    E1Indoor/Outdoor units communication error
    E2Zero-crossing signal detection error
    E3Indoor fan Speed has been out of control
    E4Indoor room temperature sensor T1 open circuit or short circuit
    E5Evaporator coil temperature sensor T2 open circuit or short circuit
    ECRefrigerant leakage detection
    F0Overload current protection
    F1Outdoor ambient temperature sensor T4 open circuit or short circuit
    F2Condenser coil temperature sensor T3 open circuit or short circuit
    F3Compressor discharge temperature sensor TP open circuit or short circuit
    F4 Outdoor unit EEPROM parameter error
    F5 Outdoor fan speed has been out of control
    P0IPM malfunction or IGBT over strong current protection
    P1Over voltage or over low voltage protection
    P2High temperature protection of IPM module or compressor top
    P3Outdoor ambient temperature too low
    P4Inverter compressor drive error
    P5Indoor units mode conflict (multi-zone only)
    P6Low pressure protection (Only for 36K)

    Read Here for full Pioneer Mini Split Error Codes List with Causes and Fixes
     
    Carrier Mini Split Error Codes and Meanings
    Display Status
    08Defrost Mode 1
    0ADefrost Mode 2
    F3Outdoor ambient temperature sensor
    malfunction
    F4Outdoor mid ---coil temperature sensor
    malfunction
    F5Outdoor discharge air temperature sensor
    F7Cooling oil return cycle
    E1System high pressure protection
    E2Indoor freeze protection
    E3System low pressure protection
    E4Compressor discharge high temperature
    protection
    E6Communication error between indoor
    and outdoor
    E7Mode conflict
    E8System overload protection
    E9Cold Blow Protection
    ddTest mode
    FoPump down mode
    P0PM Rest
    P5Compressor current protection
    P6Communication error between the inverter
    drive and main board
    P7Heat sink temperature sensor malfunction
    P8IPM over temperature protection
    P9Open Contactor
    PcCurrent sensor malfunction
    PdCurrent sensor mis ---wiring protection
    PAInput current protection
    PFInverter board ambient temperature sensor
    malfunction
    PL Low voltage protection
    PHHigh voltage protection
    PPAbnormal input AC voltage
    PUCapacitor charging malfunction
    H1Defrost or heating oil return cycle
    H3Compressor overheat protection
    H5IPM Protection
    H7Compressor speed reduction
    HcPFC board protection
    L9Compressor high voltage protection
    LcCompressor start ---up failure
    LdCompressor phase loss protection
    LECompressor stalling
    LFCompressor over ---speed protection
    A5Condenser coil inlet temp sensor malfunction
    A7Condenser outlet temperature sensor
    malfunction
    EEMemory card error
    EnFrequency limitation for module circuit protection
    EUFrequency limitation for module temperature
    protection
    F6Frequency limitation for overload protection
    F8Frequency limitation for system circuit
    protection
    F9Frequency limitation for module circuit
    protection
    FHFrequency limitation for freeze protection
    HECompressor demagnetizing protection
    LPIndoor and outdoor units mismatch
    U1Compressor phase detection malfunction
    U3Low DC bus voltage
    dnCommunication error between main board
    and EXV

    Read Here for Full Carrier Mini Split Error Codes List
     
    Cooper and Hunter Mini Split Error Codes and Meanings
    Error CodePower LEDStatus
    E1OFF 3s
    and blink
    once    		High
    pressure
    protection of
    system
    E2OFF 3S
    and blink
    twice    		Antifreezing
    protection
    F0In defect of
    refrigerant
    E4OFF 3S
    and blink
    4 times    		High
    discharge
    temperature
    protection of
    compressor
    E5OFF 3S
    and blink
    5
    times    		5 Overcurrent
    protection
    E6OFF 3S
    and blink
    6 times    		Communication
    Malfunction
    E8OFF 3S
    and blink
    8
    times    		High
    temperature
    resistant
    protection
    EEEEPROM
    malfunction
    EULimit/
    decrease
    frequency
    due to high
    temperature
    of module
    C5OFF 3S
    and blink
    15 times    		Malfunction
    protection of
    jumper cap
    FoOFF 3S
    and blink
    1 times
    		1 Gathering
    refrigerant
    F1Indoor
    ambient
    temperature
    sensor is
    open/short
    circuited
    F1Indoor
    ambient
    temperature
    sensor is
    open/short
    circuited
    F2Indoor
    evaporator
    temperature
    sensor is
    open/short
    circuited
    F3Outdoor
    ambient
    temperature
    sensor is
    open/short
    circuited
    F4Outdoor
    condenser
    temperature
    sensor is
    open/short
    circuited
    F5Outdoor
    discharge
    temperature
    sensor is
    open/short
    circuited
    F6Limit/
    decrease
    frequency
    due to
    overload
    F8Decrease
    frequency
    due to
    overcurrent
    F9Decrease
    frequency
    due to
    high air
    discharge
    F9Decrease
    frequency
    due to
    high air
    discharge
    FHLimit/
    decrease
    frequency
    due to
    antifreezing
    PHVoltage for
    DC bus-bar
    is too high
    PLVoltage of
    DC bus-bar
    is too low
    P0Compressor
    Min
    frequence in
    test state
    P1Over Voltage or Low Voltage Protection
    P2Compressor
    maximum
    frequence in
    test state
    P3Compressor
    intermediate
    frequence in
    test state
    P5Overcurrent
    protection of
    phase
    current for
    compressor
    PUCharging
    malfunction
    of capacitor
    P7Malfunction
    of module
    temperature
    sensor circuit
    P8Module high
    temperature
    protection
    P8Module high
    temperature
    protection
    H0Decrease
    frequency
    due to high
    temperature
    resistant
    during
    heating
    operation
    H2Static
    dedusting
    protection
    H3Overload
    protection for
    compressor
    H4System is
    abnormal
    H5IPM
    protection
    H5Module
    temperature
    is too high
    H6Internal motor
    (fan motor) do
    not operate
    H7Desynchronizing of
    compressor
    HCPFC
    protection
    L3Outdoor DC
    fan motor
    malfunction
    L9power
    protection
    LCFailure startup
    U1Malfunction of
    phase current
    detection
    circuit for
    compressor
    U5Malfunction
    of complete
    units current
    detection
    U7The four-way
    valve is
    abnormal
    U9OFF 3S
    and blink
    18 times    		Zerocrossing
    malfunction of
    outdoor unit
    H1Defrosting

     
    Daikin Mini Split Error Codes and Meanings
    Error CodeStatus
    00NORMAL
    U0REFRIGERANT SHORTAGE
    U2OVER-VOLTAGE DETECTION
    U4SIGNAL TRANSMISSION ERROR (BETWEEN INDOOR AND OUTDOOR UNIT)
    A1INDOOR UNIT PCB ABNORMALITY
    A5FREEZE-UP PROTECTION OR HEATING PEAK-CUT CONTROL
    A6FAN MOTOR (DC MOTOR) ABNORMALITY
    C4INDOOR HEAT EXCHANGER THERMISTOR ABNORMALITY
    C7FRONT PANEL OPEN /CLOSE FAULT
    C9ROOM TEMPERATURE THERMISTOR ABNORMALITY
    EAFOUR WAY VALVE ABNORMALITY
    E1OUTDOOR UNIT PCB ABNORMALITY
    E5OL ACTIVATION (COMPRESSOR OVERLOAD)
    E6COMPRESSOR LOCK
    E7DC FAN LOCK
    F3DISCHARGE PIPE TEMPERATURE CONTROL
    H0COMPRESSOR SYSTEM SENSOR ABNORMALITY
    H6POSITION SENSOR ABNORMALITY
    H8DC VOLTAGE / CURRENT SENSOR ABNORMALITY
    H9OUTDOOR TEMPERATURE THERMISTOR ABNORMALITY
    J3DISCHARGE PIPE THERMISTOR ABNORMALITY
    J6OUTDOOR HEAT EXCHANGER THERMISTOR ABNORMALITY
    L4RADIATION FIN TEMPERATURE RISE
    L5OUTPUT OVERCURRENT DETECTION
    P4RADIATION FIN THERMISTOR ABNORMALITY

    Read Here for Full Daikin Mini Split Error Codes List

    Category: Mini split heating and cooling air conditioner heat pump systems

    About Aaron H. Benetti

    Aaron H. Benetti an HVAC technician who has worked in the field since 1991. He began his career as an HVAC installer and later began doing troubleshooting and repairs. Around 2010, he began to write books on HVAC topics, mainly tutorials and how-to information. Currently, Aaron works as an HVAC tech and also writes many articles and posts for websites as well as books and videos on HVAC topics.

    21 thoughts on “Mini Split Error Code List and Meanings”

    1. Marlene albright

      My senville wall unit keeps shutting off and pc than 3 pops up what does that mean

      Reply ↓
    2. Chris

      I am getting an Fy Code but I cant Find this code in any of the manuals.

      Does anyone know what this is:?

      Reply ↓
    3. Doc

      we have a Rovsun 12000 BTU, 230v–shows “FY” code, cools only (NO HEAT), seller provides NO manual, seems “FY” is also an anomaly here as well.

      Reply ↓
    4. Gregory Terrell

      my pipe is freezing up but no cold air, have a error 43 and 44 on controller board using a mr. cool split ac unit. I’ve been using unit for over a year never a problem

      Reply ↓
    5. Colby

      I’m getting a E9 on my Gibson mini split. Anyone know what E9 is? My manual is missing.

      Reply ↓
    6. Mike

      My Pioneer Inverter mini split will not run two heads at the same time….the digital display shows 2 hyphens (- -)

      Reply ↓
      1. Colin

        Both units must be in same mode….both cool, both heat, not one on cool and other on heat .

        Reply ↓
    7. Doug Wendling

      The temp LED’s are showing – -, two dashes and the unit shuts off????

      Reply ↓
      1. Michael Milano

        Did you ever find out what caused this – – ? I have the same issue.

        Reply ↓
    9. Gary Rawding

      IPC mini split heat pump model … DLF4HH12K1A1 error code F3 . Could you tell me what it means.
      Thanks
      Gary

      Reply ↓
    10. Kelly

      My Pioneer Mini Split 9000 BTU is beeping every ten seconds or so and showing 88 and the WiFi signal. Not sure what code that is as it is not on the list. Any help or info would be appreciated

      Reply ↓
      1. James Fultz

        My air temp shuts down 6-8 times in 24 hr period, power light comes on temperature stays light up but 3 mins later it comes back on as normal. It only started since I turned on the heat and only use to be once a day but now it’s 6-8 times a day or every 3-4 hrs.

        Reply ↓
      2. Doc

        you might want to check the batteries on your remote. Highest temp read is 88 degrees. Seems your remote is stuck on 88 for that reason? just guessing…

        Reply ↓
    11. Matthew Wynia

      I have a Carrier unit giving me an L3 code – don’t see it listed above. Any ideas what might be going wrong? It’s not heating…

      Reply ↓
      1. Susan

        I have a d2 code too on my pioneer split unit and cannot find out what it means. I spoke with a technician who told me he doesn’t know either. Did you happen to find out what it means?

        Reply ↓
        1. Angie

          I also have this same d2 code on mine. Did you ever figure out what it means?

          Reply ↓
    14. Tracey Brown

      My two indor units show an F1 error, it is brand new out of the box and had an ac guy put the vacuum pu,p and all the connections, we tested all the power and grounds, we looked at the mother board and could not find any loose connections.

      Reply ↓

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