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 some Pioneer Mini Split models means there is a problem with the Indoor/Outdoor unit’s communication.
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, so always match the code to your unit manual.
Also, power the unit off for a few minutes before deeper diagnosis.
Pioneer Mini Split Error Codes and Meanings
| Display | Status |
|---|---|
| E0 | Indoor unit EEPROM parameter error |
| E1 | Indoor/Outdoor units communication error |
| E2 | Zero-crossing signal detection error |
| E3 | Indoor fan Speed has been out of control |
| E4 | Indoor room temperature sensor T1 open circuit or short circuit |
| E5 | Evaporator coil temperature sensor T2 open circuit or short circuit |
| EC | Refrigerant leakage detection |
| F0 | Overload current protection |
| F1 | Outdoor ambient temperature sensor T4 open circuit or short circuit |
| F2 | Condenser coil temperature sensor T3 open circuit or short circuit |
| F3 | Compressor discharge temperature sensor TP open circuit or short circuit |
| F4 | Outdoor unit EEPROM parameter error |
| F5 | Outdoor fan speed has been out of control |
| P0 | IPM malfunction or IGBT over strong current protection |
| P1 | Over voltage or over low voltage protection |
| P2 | High temperature protection of IPM module or compressor top |
| P3 | Outdoor ambient temperature too low |
| P4 | Inverter compressor drive error |
| P5 | Indoor units mode conflict (multi-zone only) |
| P6 | Low 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 |
|---|---|
| 08 | Defrost Mode 1 |
| 0A | Defrost Mode 2 |
| F3 | Outdoor ambient temperature sensor malfunction |
| F4 | Outdoor mid —coil temperature sensor malfunction |
| F5 | Outdoor discharge air temperature sensor |
| F7 | Cooling oil return cycle |
| E1 | System high pressure protection |
| E2 | Indoor freeze protection |
| E3 | System low pressure protection |
| E4 | Compressor discharge high temperature protection |
| E6 | Communication error between indoor and outdoor |
| E7 | Mode conflict |
| E8 | System overload protection |
| E9 | Cold Blow Protection |
| dd | Test mode |
| Fo | Pump down mode |
| P0 | IPM Rest |
| P5 | Compressor current protection |
| P6 | Communication error between the inverter drive and main board |
| P7 | Heat sink temperature sensor malfunction |
| P8 | IPM over temperature protection |
| P9 | Open Contactor |
| Pc | Current sensor malfunction |
| Pd | Current sensor mis —wiring protection |
| PA | Input current protection |
| PF | Inverter board ambient temperature sensor malfunction |
| PL | Low voltage protection |
| PH | High voltage protection |
| PP | Abnormal input AC voltage |
| PU | Capacitor charging malfunction |
| H1 | Defrost or heating oil return cycle |
| H3 | Compressor overheat protection |
| H5 | IPM Protection |
| H7 | Compressor speed reduction |
| Hc | PFC board protection |
| L9 | Compressor high voltage protection |
| Lc | Compressor start —up failure |
| Ld | Compressor phase loss protection |
| LE | Compressor stalling |
| LF | Compressor over —speed protection |
| A5 | Condenser coil inlet temp sensor malfunction |
| A7 | Condenser outlet temperature sensor malfunction |
| EE | Memory card error |
| En | Frequency limitation for module circuit protection |
| EU | Frequency limitation for module temperature protection |
| F6 | Frequency limitation for overload protection |
| F8 | Frequency limitation for system circuit protection |
| F9 | Frequency limitation for module circuit protection |
| FH | Frequency limitation for freeze protection |
| HE | Compressor demagnetizing protection |
| LP | Indoor and outdoor units mismatch |
| U1 | Compressor phase detection malfunction |
| U3 | Low DC bus voltage |
| dn | Communication 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 Code | Power LED | Status |
|---|---|---|
| E1 | OFF 3s and blink once |
High pressure protection of system |
| E2 | OFF 3S and blink twice |
Antifreezing protection |
| F0 | In defect of refrigerant |
|
| E4 | OFF 3S and blink 4 times |
High discharge temperature protection of compressor |
| E5 | OFF 3S and blink 5 times |
Overcurrent protection |
| E6 | OFF 3S and blink 6 times |
Communication Malfunction |
| E8 | OFF 3S and blink 8 times |
High temperature resistant protection |
| EE | EEPROM malfunction |
|
| EU | Limit/ decrease frequency due to high temperature of module |
|
| C5 | OFF 3S and blink 15 times |
Malfunction protection of jumper cap |
| Fo | OFF 3S and blink 1 times |
Gathering refrigerant |
| F1 | Indoor ambient temperature sensor is open/short circuited |
|
| F1 | Indoor ambient temperature sensor is open/short circuited |
|
| F2 | Indoor evaporator temperature sensor is open/short circuited |
|
| F3 | Outdoor ambient temperature sensor is open/short circuited |
|
| F4 | Outdoor condenser temperature sensor is open/short circuited |
|
| F5 | Outdoor discharge temperature sensor is open/short circuited |
|
| F6 | Limit/ decrease frequency due to overload |
|
| F8 | Decrease frequency due to overcurrent |
|
| F9 | Decrease frequency due to high air discharge |
|
| F9 | Decrease frequency due to high air discharge |
|
| FH | Limit/ decrease frequency due to antifreezing |
|
| PH | Voltage for DC bus-bar is too high |
|
| PL | Voltage of DC bus-bar is too low |
|
| P0 | Compressor Min frequence in test state |
|
| P1 | Over Voltage or Low Voltage Protection | |
| P2 | Compressor maximum frequence in test state |
|
| P3 | Compressor intermediate frequence in test state |
|
| P5 | Overcurrent protection of phase current for compressor |
|
| PU | Charging malfunction of capacitor |
|
| P7 | Malfunction of module temperature sensor circuit |
|
| P8 | Module high temperature protection |
|
| P8 | Module high temperature protection |
|
| H0 | Decrease frequency due to high temperature resistant during heating operation |
|
| H2 | Static dedusting protection |
|
| H3 | Overload protection for compressor |
|
| H4 | System is abnormal |
|
| H5 | IPM protection |
|
| H5 | Module temperature is too high |
|
| H6 | Internal motor (fan motor) do not operate |
|
| H7 | Desynchronizing of compressor |
|
| HC | PFC protection |
|
| L3 | Outdoor DC fan motor malfunction |
|
| L9 | power protection |
|
| LC | Failure startup | |
| U1 | Malfunction of phase current detection circuit for compressor |
|
| U5 | Malfunction of complete units current detection |
|
| U7 | The four-way valve is abnormal |
|
| U9 | OFF 3S and blink 18 times |
Zerocrossing malfunction of outdoor unit |
| H1 | Defrosting |
Daikin Mini Split Error Codes and Meanings
| Error Code | Status |
|---|---|
| 00 | NORMAL |
| U0 | REFRIGERANT SHORTAGE |
| U2 | OVER-VOLTAGE DETECTION |
| U4 | SIGNAL TRANSMISSION ERROR (BETWEEN INDOOR AND OUTDOOR UNIT) |
| A1 | INDOOR UNIT PCB ABNORMALITY |
| A5 | FREEZE-UP PROTECTION OR HEATING PEAK-CUT CONTROL |
| A6 | FAN MOTOR (DC MOTOR) ABNORMALITY |
| C4 | INDOOR HEAT EXCHANGER THERMISTOR ABNORMALITY |
| C7 | FRONT PANEL OPEN /CLOSE FAULT |
| C9 | ROOM TEMPERATURE THERMISTOR ABNORMALITY |
| EA | FOUR WAY VALVE ABNORMALITY |
| E1 | OUTDOOR UNIT PCB ABNORMALITY |
| E5 | OL ACTIVATION (COMPRESSOR OVERLOAD) |
| E6 | COMPRESSOR LOCK |
| E7 | DC FAN LOCK |
| F3 | DISCHARGE PIPE TEMPERATURE CONTROL |
| H0 | COMPRESSOR SYSTEM SENSOR ABNORMALITY |
| H6 | POSITION SENSOR ABNORMALITY |
| H8 | DC VOLTAGE / CURRENT SENSOR ABNORMALITY |
| H9 | OUTDOOR TEMPERATURE THERMISTOR ABNORMALITY |
| J3 | DISCHARGE PIPE THERMISTOR ABNORMALITY |
| J6 | OUTDOOR HEAT EXCHANGER THERMISTOR ABNORMALITY |
| L4 | RADIATION FIN TEMPERATURE RISE |
| L5 | OUTPUT OVERCURRENT DETECTION |
| P4 | RADIATION FIN THERMISTOR ABNORMALITY |
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Thanks
Gary
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