Pioneer AC Error Codes List and Solutions

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 CodesProblem
E0Indoor/outdoor communication fault
ECOutdoor communication fault
E1Room temperature sensor (IRT)
E2
Indoor pipe (coil) temperature sensor (IPT)
E3Outdoor pipe (coil) temperature sensor (OPT)
E4System abnormal
E5Model configuration wrong
E6Indoor fan motor fault
E7
Outdoor temperature sensor
E8Exhaust temperature sensor
E9Intelligent power module of drive and module fault
EFOutdoor fan motor fault (DC Motor)
EACurrent sensor fault
EEEEPROM fault
EPTemperature switch fault (on top of the compressor)
EUVoltage sensor fault
EHIntake temperature sensor
P1
Overvoltage / undervoltage protection
P2Overcurrent protection
P4 Exhaust overtemperature protection
P5Subcooling protection under cooling mode
P6Overheating protection under cooling mode
P7Overheating protection under heating mode
P8 Outdoor overtemperature / undertemperature protection
P9Drive protection (software control )
P0Module protection (hardware control)

Split Dc Inverter – AC / Heat Pump Systems Codes

Pioneer Split AC Error Codes and Troubleshooting
Pioneer Split AC Error Codes and Troubleshooting
Error CodesProblem
E0Indoor unit EEPROM parameter error.
E1 Indoor / outdoor units communication error
E2Zero-crossing signal detection error
E3 Indoor fan speed has been out of control
E4 Indoor room temperature sensor T1 open circuit or short circuit
E5Evaporator coil temperature sensor T2 open circuit or short circuit
ECRefrigerant leakage detection
F1 Outdoor temperature sensor T4 open circuit or short circuit
F2Condenser coil temperature sensor T3 open circuit or short circuit
F3Compressor discharge temperature sensor T5 open circuit or short circuit
F4 Outdoor unit EEPROM parameter error
P0IPM malfunction or IGBT over-strong current protection
P1Over voltage or Under voltage protection
P2High temperature protection of compressor top
P4Inverter compressor drive error

Multi Outdoor Systems Codes

Pioneer Multi AC Error Codes and Troubleshooting
Pioneer Multi AC Error Codes and Troubleshooting
DisplayFailure
E0Indoor EEPROM malfunction
E1 Communication malfunction between indoor and outdoor units
E2Zero-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
P0IPM module protection or IGBT over-strong current protection
P1 Voltage protection
P2Temperature protection of compressor top
P3 Outdoor temperature is lower than -15°C(optional function)
P4 Inverter compressor drive protection
P5Mode conflict

Diagnosis and Solutions

Pioneer AC Diagnosis and Solution
Pioneer AC Diagnosis and Solution

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

Service Manual Pdf

Pioneer Air Conditioner Service Manual PDF

Danny Reese


*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.

6 thoughts on “Pioneer AC Error Codes List and Solutions”

  1. 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?

    Reply

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