Mini split units are nice to have and usually very reliable heating and cooling packages.
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 means there is a problem with the Indoor/Outdoor units communication.
Often error codes can be manufacture 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 manufactures.
Keep in mind that there may be differences between models but most the codes should match.
I will list more error code meanings for mini splits units as I have time.
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) |
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 | PM 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 |