The MIDEA Air Conditioner Error Codes help technicians and users identify potential issues with the air conditioning system.
MIDEA R-Series Error Codes
| Error Code | Meaning |
|---|---|
| E0 | EEPROM parameter error |
| E1 | Indoor/outdoor unit communication protection |
| E2 | Zero-crossing signal error |
| E3 | Fan speed out of control |
| E5 | Outdoor temperature sensor circuit open or short-circuited |
| E6 | Ambient or evaporator temperature sensor circuit open or short-circuited |
| E7 | Outdoor fan speed out of control |
| P0 | IGBT overcurrent protection |
| P1 | Overvoltage or undervoltage protection |
| P2 | Compressor top temperature protection |
| P4 | Inverter compressor drive error |
| P5 | Inverter module protection |
| EL OC | Pressure fault: Check for dirty filters, blocked fan, malfunctioning indoor unit, or refrigerant leak. |
MIDEA Outdoor Unit Error Codes
| Error Code | Fault Description |
|---|---|
| E0 | EEPROM error |
| E1 | Coil outlet temp sensor or connector malfunction (No A) |
| E2 | Coil outlet temp sensor or connector malfunction (No B) |
| E3 | Coil outlet temp sensor or connector malfunction (No C) |
| E4 | Outdoor unit temperature sensor or connector malfunction |
| E5 | Compressor voltage protection |
| E6 | Coil outlet temp sensor or connector malfunction (No D) |
| E7 | Communication fault between outdoor main chip and compressor control chip |
| P0 | Compressor discharge or top temperature protection |
| P1 | High-pressure protection (specific models only) |
| P2 | Low-pressure protection (specific models only) |
| P3 | Compressor current protection |
| P4 | Inverter module protection |
| P6 | High-temperature protection of the condenser |
Wall-Mounted Air Conditioner Codes
| Fault Code | Meaning |
|---|---|
| P0 | IGBT overcurrent |
| P1 (Green LED 6: On; Red LED 5: On) | Overvoltage or undervoltage protection |
| P1 (Green LED 6: On; Red LED 5: Flashing) | MCE malfunction |
| P4 (Green LED 6: Off; Red LED 5: Flashing) | MCE startup malfunction |
| P4 (Green LED 6: Flashing; Red LED 5: On) | MCE phase-loss, zero-speed, or PWM phase error protection |
| P4 (Green LED 6: Flashing; Red LED 5: Flashing) | Communication fault |
Portable Air Conditioner Error Codes
| Error Code | Cause |
|---|---|
| E1 | Ambient temperature sensor error: Unplug and reconnect. If the issue persists, contact technical support. |
| E2 | Evaporator temperature sensor error: Unplug and reconnect. If the issue persists, contact technical support. |
| E4 | Display panel communication error: Unplug and reconnect. If the issue persists, contact technical support. |
| E5 | Automatic sliding panel malfunction: Unplug and reconnect. If the issue persists, contact technical support. |
| E0 | Unit malfunction: Unplug and reconnect. If the issue persists, contact technical support. |
Detailed Error Diagnostics
L0: Module Protection
- Meaning: Issue with the compressor inverter module or DC generator connection.
- Diagnostics:
- Check compressor resistance between U, V, and W terminals (should be equal and 0.9–5 Ohms).
- Check DC voltage between P and N terminals (1.41x local supply voltage).
L1: Low Voltage Protection
- Meaning: Low voltage in the system.
- Diagnostics: Verify DC voltage between terminals 1 and 2 (510–580 V).
L2: High Voltage Protection
- Meaning: High voltage in the system.
- Diagnostics: Check DC voltage across capacitors and rectify abnormalities.
L4: MCE Error
- Meaning: Motor Control Error.
- Diagnostics: Inspect connections and circuit integrity.
L5: Zero Speed Protection
- Meaning: Compressor fails to reach adequate speed.
- Diagnostics: Check module and wiring connections.
L7: Phase Sequence Error
- Meaning: Incorrect power supply phase sequence.
- Diagnostics: Verify correct phase sequence.
L8 & L9: Frequency Discrepancy
- Meaning: Significant difference between real and set frequency.
- Diagnostics: Measure compressor resistance; verify control box functionality.
Prepared by: Ing. G
