Pioneer Mini Split Error Codes List with Causes and Fixes

By | March 28, 2022

Pioneer Mini Split Error Code List with Causes and Fixes
If you have a Pioneer mini split that is giving an error code, the list below gives the error meaning.

The Pioneer mini split error code list will give general information on what problem the unit is having.

Also below are common causes and fixes when a Pioneer mini split has an error.

Pioneer Mini Split Error Codes List
Pioneer Mini Split Error Codes List and Meanings

  • 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 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)

Common Causes and Fixes with a Pioneer Mini Split

  • Power Cycle the Unit
  • Power Cycle the Unit
    The first step for an error is to power off the unit and turn the breaker/disconnect off.

    Let the unit sit for 5 minutes with no power, then turn the breaker/disconnect back on and the power back on the unit.

    Often when an error occurs, it simply needs to be power cycled to clear.

    If the error comes back, then more troubleshooting will need to be done.

  • Bad Communication Wire or Connection
  • Bad Communication Wire or Connection
    While a component may have failed on a mini split system, many errors are caused by bad connections.

    This is mainly with the communication lines that run between the inside and outside units.

    The wires will be labeled inside the front panel on the inside unit and next to the power on the outside unit.
    Bad Communication Wire or Connection 2
    Check all the connections on the communication wires and check for any breaks often can solve issues.

    An HVAC technician will use multi meter to check for continuity on each line, making sure there are no opens or shorts.

  • Refrigerant Low
  • Refrigerant Low
    If there is a leak, the refrigerant will become low, and the unit will stop working.

    Often when the refrigerant is low, the inside condenser will start to drip water.

    A common error for a Pioneer mini split with low refrigerant is an EC error code, but other codes can also display, or in some cases, none will display.

    If the system is low on refrigerant, the leak will need to be found, and refrigerant added back into the system.

    A common failure point for leaks is the flanges where the copper line set is bolted together.

    The flanges that come from the manufacturer notoriously cause issues and can leak sometimes.

  • Condensing Fan Motor
  • Condensing Fan Motor
    The condensing fan is the big fan on the outside unit which blows air away from the unit.

    If it fails and stops working, it will cause issues.

    Check around the fan that no debris has blown into the outside unit and has stopped the fan from turning.

    If debris stops the fan from spinning, it will cause an issue and need to be cleaned out.

    The motor may also have gone bad or have a wiring issue.

  • Computer Board
  • One of the computer boards may have malfunctioned.

    The connections between the boards can all be pushed in to see if any have become loose.

    The onboard computer chips EEPROM and others can also be pushed in to be sure they are connected well.

    The boards can also go bad and need to be replaced.

    A board can go bad from a power spike or a bad wiring connection.

Pioneer Mini Split Error Codes and Meanings

DisplayStatus  
E0Indoor unit EEPROM parameter errorHow To Fix E0 Error Code
E1Indoor/Outdoor units communication errorHow To Fix E1 Error Code
E2Zero-crossing signal detection errorHow To Fix E2 Error Code
E3Indoor fan Speed has been out of control How To Fix E3 Error Code
E4Indoor room temperature sensor T1 open circuit or short circuit How To Fix E4 Error Code
E5Evaporator coil temperature sensor T2 open circuit or short circuit How To Fix E5 Error Code
ECRefrigerant leakage detection How To Fix EC Error Code
F0Overload current protection How To Fix F0 Error Code
F1Outdoor ambient temperature sensor T4 open circuit or short circuit How To Fix F1 Error Code
F2Condenser coil temperature sensor T3 open circuit or short circuit How To Fix F2 Error Code
F3Compressor discharge temperature sensor TP open circuit or short circuit How To Fix F3 Error Code
F4 Outdoor unit EEPROM parameter error How To Fix F4 Error Code
F5 Outdoor fan speed has been out of control How To Fix E5 Error Code
P0IPM malfunction or IGBT over strong current protection How To Fix P0 Error Code
P1Over voltage or over low voltage protection
P2High temperature protection of IPM module or compressor top How To Fix P2 Error Code
P3Outdoor ambient temperature too low
P4Inverter compressor drive error
P5Indoor units mode conflict (multi-zone only)
P6Low pressure protection (Only for 36K)

Summary
If your Pioneer mini split is giving an error code, use the chart above to see what the problem is with the unit.

For example, if the unit is displaying an E0 error code, the unit is having a problem with the indoor unit EEPROM parameter.

Once the error is known, try a power reset to see if the error clears.

When doing a power reset, it is best to pull the disconnect or turn off the breaker and wait a few minutes.

The communication lines between the units are a common failure and should be checked for any bad connections.

Other common issues include low refrigerant, condensing fan motor, and computer board problems.

Have you had an issue with a code on your Pioneer mini split? Let us know your thoughts below.

6 thoughts on “Pioneer Mini Split Error Codes List with Causes and Fixes

  1. Gary Charles

    I put in a pioneer mini split after running it for 8 months I am getting a fp error code I can’t find that one listed

    Reply
  2. David Pusateri

    I have a brand new unit and was charged this morning and my A/C guy and my electrician can’t figure out what is wrong? It gives a code not listed. EL-01 Not sure how to trouble shoot this. David

    Reply
  3. Danielle Cawley

    Just put in split level, PC03 is immediately showing up but the outdoor temperature is 80 degrees. How do you fix this.

    Reply
    1. Mathias Arrua

      Did you figure out the problem? The same thing happened to me but haven’t fixed it.

      Reply
  4. Fernando Galindo

    I keep getting a P4 error on my Pioneer mini Split. I’ve already topped off the R410A, replaced the outdoor PCB and capacitor. What else can I do besides ordering an $80 part (not including the $200+ shipping).

    Reply
    1. Daniel Lewis

      Did you figure out your p4 code? I am getting the same. Just replaced an ipm board and it worked for about 8 hours. Now back to p4 code

      Reply

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