Mitsubishi Electric Error Codes

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Mitsubishi Electric error codes are used to identify and troubleshoot issues with their air conditioning systems. Here is a comprehensive list of common Mitsubishi Electric error codes and their possible causes and solutions:

Mitsubishi Electric Error Codes

  1. P1: Intake Sensor Error
    • Cause: Intake sensor malfunction.
    • Solution: Check the intake sensor for any damage or blockages and replace if necessary.
  2. P2-P9: Pipe Sensor Error
    • Cause: Pipe sensor malfunction.
    • Solution: Check the pipe sensor for any damage or blockages and replace if necessary.
  3. E6-E7: Indoor/Outdoor Unit Communication Error
    • Cause: Communication failure between indoor and outdoor units.
    • Solution: Check wiring connections and ensure proper communication between the units.
  4. P4: Drain Sensor Error
    • Cause: Drain sensor malfunction.
    • Solution: Check the drain sensor for any damage or blockages and replace if necessary.
  5. P5: Drain Pump Error
    • Cause: Drain pump malfunction.
    • Solution: Check the drain pump for any damage or blockages and replace if necessary.
  6. PA: Forced Compressor Error
    • Cause: Forced compressor malfunction.
    • Solution: Check the compressor for any damage or blockages and replace if necessary.
  7. P6: Freezing/Overheating Safeguard Operation
    • Cause: Freezing or overheating safeguard operation.
    • Solution: Check the system for any blockages or restrictions and ensure proper refrigerant charge.
  8. EE: Communication Error Between Indoor and Outdoor Units
    • Cause: Communication failure between indoor and outdoor units.
    • Solution: Check wiring connections and ensure proper communication between the units.
  9. P8: Pipe Temperature Error
    • Cause: Pipe temperature malfunction.
    • Solution: Check the pipe temperature sensor for any damage or blockages and replace if necessary.
  10. E4: Remote Controller Signal Receiving Error
    • Cause: Remote controller signal receiving error.
    • Solution: Check the remote controller for any damage or malfunctions and replace if necessary.
  11. Fb: Indoor Unit Control System Error
    • Cause: Indoor unit control system malfunction.
    • Solution: Check the indoor unit control system for any damage or malfunctions and replace if necessary.
  12. E0-E3: Remote Controller Transmission Error
    • Cause: Remote controller transmission error.
    • Solution: Check the remote controller for any damage or malfunctions and replace if necessary.
  13. E1-E2: Remote Controller Control Board Error
    • Cause: Remote controller control board malfunction.
    • Solution: Check the remote controller control board for any damage or malfunctions and replace if necessary.
  14. E9: Indoor/Outdoor Unit Transmission Error
    • Cause: Indoor/outdoor unit transmission error.
    • Solution: Check the indoor/outdoor unit transmission for any damage or malfunctions and replace if necessary.
  15. UP: Compressor Overcurrent Interruption
    • Cause: Compressor overcurrent interruption.
    • Solution: Check the compressor for any damage or blockages and replace if necessary.
  16. U3-U4: Open/Short of Outdoor Unit Thermistors
    • Cause: Open or short of outdoor unit thermistors.
    • Solution: Check the outdoor unit thermistors for any damage or malfunctions and replace if necessary.
  17. UF: Compressor Overcurrent Interruption (When Compressor Locked)
    • Cause: Compressor overcurrent interruption when compressor is locked.
    • Solution: Check the compressor for any damage or blockages and replace if necessary.
  18. U2: Abnormal High Discharging Temperature/Insufficient Refrigerant
    • Cause: Abnormal high discharging temperature or insufficient refrigerant.
    • Solution: Check the refrigerant levels and recharge if necessary.
  19. U1-Ud: Abnormal High Pressure/Overheating Safeguard Operation
    • Cause: Abnormal high pressure or overheating safeguard operation.
    • Solution: Check the system for any blockages or restrictions and ensure proper refrigerant charge.
  20. U5: Abnormal Temperature of Heat Sink
    • Cause: Abnormal temperature of heat sink.
    • Solution: Check the heat sink for any damage or malfunctions and replace if necessary.
  21. U8: Outdoor Unit Fan Safeguard Stop
    • Cause: Outdoor unit fan safeguard stop.
    • Solution: Check the outdoor unit fan for any damage or malfunctions and replace if necessary.
  22. U6: Compressor Overcurrent Interruption/Abnormal Power Module
    • Cause: Compressor overcurrent interruption or abnormal power module.
    • Solution: Check the compressor for any damage or blockages and replace if necessary.
  23. U7: Abnormal Superheat Due to Low Discharge Temperature
    • Cause: Abnormal superheat due to low discharge temperature.
    • Solution: Check the system for any blockages or restrictions and ensure proper refrigerant charge.
  24. U9: Abnormality Such as Overvoltage or Voltage Shortage and Abnormal Synchronous Signal
    • Cause: Abnormality such as overvoltage or voltage shortage and abnormal synchronous signal.
    • Solution: Check the electrical supply and ensure proper power distribution.
  25. UH: Abnormality Such as Overvoltage or Voltage Shortage and Abnormal Synchronous Signal
    • Cause: Abnormality such as overvoltage or voltage shortage and abnormal synchronous signal.
    • Solution: Check the electrical supply and ensure proper power distribution.
  26. Current Sensor Error
    • Cause: Current sensor malfunction.
    • Solution: Check the current sensor for any damage or malfunctions and replace if necessary.
  27. Pressure Sensor Error
    • Cause: Pressure sensor malfunction.
    • Solution: Check the pressure sensor for any damage or malfunctions and replace if necessary.
  28. Temperature Sensor Error
    • Cause: Temperature sensor malfunction.
    • Solution: Check the temperature sensor for any damage or malfunctions and replace if necessary.
  29. Return Air Thermistor Error
    • Cause: Return air thermistor malfunction.
    • Solution: Check the return air thermistor for any damage or malfunctions and replace if necessary.
  30. Outdoor Unit Inverter Heatsink Thermistor Error
    • Cause: Outdoor unit inverter heatsink thermistor malfunction.
    • Solution: Check the outdoor unit inverter heatsink thermistor for any damage or malfunctions and replace if necessary.
  31. Loose Float Switch
    • Cause: Loose float switch.
    • Solution: Check the float switch for any damage or malfunctions and replace if necessary.
  32. Remote Controller Issue
    • Cause: Remote controller malfunction.
    • Solution: Check the remote controller for any damage or malfunctions and replace if necessary.
  33. Address Overlap
    • Cause: Address overlap.
    • Solution: Check the address settings and ensure proper configuration.
  34. Polarity Setting Error
    • Cause: Polarity setting error.
    • Solution: Check the polarity settings and ensure proper configuration.
  35. Transmission Processor Hardware Error
    • Cause: Transmission processor hardware malfunction.
    • Solution: Check the transmission processor for any damage or malfunctions and replace if necessary.
  36. Transmission Line Busy
    • Cause: Transmission line busy.
    • Solution: Check the transmission line for any blockages or restrictions and ensure proper communication.
  37. Communication Fault
    • Cause: Communication fault.
    • Solution: Check the communication lines for any blockages or restrictions and ensure proper communication.
  38. No ACK
    • Cause: No ACK.
    • Solution: Check the communication lines for any blockages or restrictions and ensure proper communication.
  39. No Response
    • Cause: No response.
    • Solution: Check the communication lines for any blockages or restrictions and ensure proper communication.
  40. MA Controller Signal Reception Error
    • Cause: MA controller signal reception error.
    • Solution: Check the MA controller for any damage or malfunctions and replace if necessary.
  41. MA Controller Comms Fault
    • Cause: MA controller communication fault.
    • Solution: Check the MA controller for any damage or malfunctions and replace if necessary.
  42. Total Capacity Error
    • Cause: Total capacity error.
    • Solution: Check the total capacity settings and ensure proper configuration.
  43. Capacity Code Setting Error
    • Cause: Capacity code setting error.
    • Solution: Check the capacity code settings and ensure proper configuration.
  44. Wrong Number of Connected Units
    • Cause: Wrong number of connected units.
    • Solution: Check the number of connected units and ensure proper configuration.
  45. Address Setting Error
    • Cause: Address setting error.
    • Solution: Check the address settings and ensure proper configuration.
  46. Attribute Setting Error
    • Cause: Attribute setting error.
    • Solution: Check the attribute settings and ensure proper configuration.
  47. Signal Transmission Error
    • Cause: Signal transmission error.
    • Solution: Check the signal transmission for any blockages or restrictions and ensure proper communication.
  48. Remote Controller Sensor Fault
    • Cause: Remote controller sensor malfunction.
    • Solution: Check the remote controller sensor for any damage or malfunctions and replace if necessary.
  49. Function Setting Error
    • Cause: Function setting error.
    • Solution: Check the function settings and ensure proper configuration.
  50. Model Setting Error
    • Cause: Model setting error.
    • Solution: Check the model settings and ensure proper configuration.
  51. Incompatible Unit Combination
    • Cause: Incompatible unit combination.
    • Solution: Check the unit combination and ensure proper compatibility.

Troubleshooting Steps

  1. Identify the Error Code: Note down the error code displayed on the indoor unit or remote control.
  2. Check the Manual: Consult the Mitsubishi Electric manual for specific troubleshooting steps for your model.
  3. Check Wiring Connections: Ensure all wiring connections are secure and not damaged.
  4. Check Sensors: Check the sensors for any damage or malfunctions and replace if necessary.
  5. Check Refrigerant Levels: Check refrigerant levels and recharge if necessary.
  6. Check for Blockages: Check the system for any blockages or restrictions.
  7. Call a Technician: If you are unable to resolve the issue yourself, call a professional technician for further assistance.

By following these steps and the specific troubleshooting procedures outlined in the manual, you should be able to resolve most common Mitsubishi Electric error codes.

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