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Pioneer AC Error Codes and Troubleshooting

 Because there are capacitors on the PCBs and relative circuitry in outdoor units, even after shutting down the power supply, electrical power remain charged in those capacitors. Do not forget to discharge the electrical power remaining in the capacitors before servicing.

Pioneer Air Conditioner Error Codes and Troubleshooting
Pioneer Air Conditioner Error Codes and Troubleshooting

Dc Inverter Split Wall-mounted Ductless Heat Pumps

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
P4Exhaust overtemperature protection
P5Subcooling protection under cooling mode
P6Overheating protection under cooling mode
P7Overheating protection under heating mode
P8Outdoor overtemperature / undertemperature protection
P9Drive protection (software control )
P0Module protection (hardware control)

Split Dc Inverter – Air Conditioner / Heat Pump Systems

Pioneer Split AC Error Codes and Troubleshooting
Pioneer Split AC Error Codes and Troubleshooting
Error CodesProblem
E0Indoor unit EEPROM parameter error.
E1Indoor / outdoor units communication error
E2Zero-crossing signal detection error
E3Indoor fan speed has been out of control
E4Indoor room temperature sensor T1 open circuit or short circuit
E5Evaporator coil temperature sensor T2 open circuit or short circuit
ECRefrigerant leakage detection
F1Outdoor 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
F4Outdoor 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 Split System Multi Circuit Outdoor Units

Pioneer Multi AC Error Codes and Troubleshooting
Pioneer Multi AC Error Codes and Troubleshooting
DisplayFailure
E0Indoor EEPROM malfunction
E1Communication malfunction between indoor and outdoor units
E2Zero-crossing signal error
E3Indoor fan speed has been out of control
E5Open circuit or short circuit of outdoor temperature sensor or outdoor EEPROM malfunction
E6Open circuit or short circuit of T1 or T2 temperature sensor
P0IPM module protection or IGBT over-strong current protection
P1Voltage protection
P2Temperature protection of compressor top
P3Outdoor temperature is lower than -15°C（optional function）
P4Inverter compressor drive protection
P5Mode conflict

Diagnosis and Solution

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

Pioneer Air Conditioner Service Manual PDF

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