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
| Error Codes | Problem |
|---|---|
| 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 overtemperature / undertemperature 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
- McQuay Air Conditioner Error Codes List - May 1, 2025
- Goodman AC Error Codes and Troubleshooting - May 1, 2025
- Electrolux AC Error Codes and Troubleshooting - May 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.
My 4-month-old Pioneer inverter mini split 24000 btu was functioning great. After a power failure and after a few on and off fluctuations the power was restored. Shortly after the ac unit began to display “EL” and “O1” error codes. We’ve turned the breaker off (longest period 24 hours) and on a number of times but the error still exists. What does this mean and how do we fix this problem?