Pioneer air conditioners use error codes to indicate various issues or malfunctions that may occur. Please note that these error codes may vary depending on the specific model and series of your Pioneer air conditioner. It’s always recommended to refer to the user manual or contact Pioneer customer.
Dc Inverter Split Wall-Mounted Ductless Heat Pumps Codes
E0: Indoor/outdoor communication fault
EC: Outdoor communication fault
E1: Room temperature sensor (IRT)
E2: Indoor pipe (coil) temperature sensor (IPT)
E3: Outdoor pipe (coil) temperature sensor (OPT)
E4: System abnormal
E5: Model configuration wrong
E6: Indoor fan motor fault
E7: Outdoor temperature sensor
E8: Exhaust temperature sensor
E9: Intelligent power module of drive and module fault
EF: Outdoor fan motor fault (DC Motor)
EA: Current sensor fault
EE: EEPROM fault
EP: Temperature switch fault (on top of the compressor)
EU: Voltage sensor fault
EH: Intake temperature sensor
P1: Overvoltage / undervoltage protection
P2: Overcurrent protection
P4: Exhaust overtemperature protection
P5: Subcooling protection under cooling mode
P6: Overheating protection under cooling mode
P7: Overheating protection under heating mode
P8: Outdoor over temperature / under temperature protection
P9: Drive protection (software control )
P0: Module protection (hardware control)
Split Dc Inverter – AC / Heat Pump Systems Codes
| Error Codes | Problem |
|---|---|
| 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 |
| F1 | Outdoor temperature sensor T4 open circuit or short circuit |
| F2 | Condenser coil temperature sensor T3 open circuit or short circuit |
| F3 | Compressor discharge temperature sensor T5 open circuit or short circuit |
| F4 | Outdoor unit EEPROM parameter error |
| P0 | IPM malfunction or IGBT over-strong current protection |
| P1 | Over voltage or Under voltage protection |
| P2 | High temperature protection of compressor top |
| P4 | Inverter compressor drive error |
Multi Outdoor Systems Codes
| Display | Failure |
|---|---|
| E0 | Indoor EEPROM malfunction |
| E1 | Communication malfunction between indoor and outdoor units |
| E2 | Zero-crossing signal error |
| E3 | Indoor fan speed has been out of control |
| E5 | Open circuit or short circuit of outdoor temperature sensor or outdoor EEPROM malfunction |
| E6 | Open circuit or short circuit of T1 or T2 temperature sensor |
| P0 | IPM module protection or IGBT over-strong current protection |
| P1 | Voltage protection |
| P2 | Temperature protection of compressor top |
| P3 | Outdoor temperature is lower than -15°C（optional function） |
| P4 | Inverter compressor drive protection |
| P5 | Mode conflict |
Diagnosis and Solutions
EEPROM parameter error diagnosis and solution(E0/F4)
Error Code: E0/F4
Malfunction decision conditions: Indoor or outdoor PCB main chip does not receive feedback from EEPROM chip.
Supposed causes:
- Installation mistake
- PCB faulty
Trouble shooting: Shut off the power supply and turn it on 5 seconds later. Is it still displaying the error code ?
If the EEPROM chip is welded on main PCB, replace the main PCB directly. Otherwise, check whether the EEPROM chip plugged in main PCB well?
Yes: Replace the main PCB
No: Correct the connection
Zero crossing detection error diagnosis and solution (E2)
Error Code: E2
Malfunction decision conditions: When PCB does not receive zero crossing signal feedback for 4 minutes or the zero crossing signal time interval is abnormal.
Supposed causes:
- Connection mistake
- PCB faulty
Trouble shooting: Check if the connections and power supply is normal?
Yes: Indoor main PCB is defective. Replace indoor main PCB.
No: Correct the connections. Trun on the unit when the power supply is good.
Over voltage or too low voltage protection diagnosis and solution (P1)
Error Code: P1
Malfunction decision conditions: An abnormal voltage rise or drop is detected by checking the specified voltage detection circuit.
Supposed causes:
- Power supply problems.
- System leakage or block
- PCB faulty
High temperature protection of compressor top diagnosis and solution(P2)
Error Code: P2
Malfunction decision conditions: If the sampling voltage is not 5V, the LED will display the failure.
Supposed causes:
- Power supply problems.
- System leakage or block
- PCB faulty
Manual
- Shinco AC Error Codes List and Solution - November 1, 2025
- Chunlan AC Error Codes and Troubleshooting - November 1, 2025
- Pioneer AC Error Codes List and Solutions - November 1, 2025
*If you can't find the code you're looking for on our site, please let us know, and we'll update our database as soon as possible.
Anyone know what error code SE is for an Aux 12000 btu Heat Pump mini split?
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Can anyone tell me what do error codes H8 and S2 mean?
Saludos por necesito información de los componentes por ejemplo EEPROM qué significa o la pieza