Ali ElmAC Error Codes
Midea air conditioners use a self-diagnostic system that displays error codes on the unit's LED panel, wired controller, or remote display. These codes help pinpoint issues ranging from simple sensor faults to serious compressor problems. Midea also manufactures units sold under other brand names (including Carrier, Toshiba Carrier, and some Comfee models), so these codes may apply to those systems too.
This guide covers every known Midea error code across their residential splits, cassette units, ducted systems, and VRF range. We have organised them by code series and included what each code actually means in plain English, plus whether you can fix it yourself or need an engineer.
How Midea Error Codes Are Displayed
Midea units display error codes in different ways depending on the model:
- Wall-mounted splits - The error code appears on the indoor unit's LED display panel. Some models show the code on the remote control screen.
- Cassette and ceiling units - Error codes are shown through LED flash patterns on the unit's indicator panel. The Operation, Timer, Defrost, and Alarm LEDs flash in specific combinations (see the LED indicator table below).
- Ducted units - Codes appear on the wired controller display.
- Newer models (2019+) - Use a two-part code format (e.g. EH 03, PC 01) shown on the wired controller or via the Midea Air app.
For model-specific code displays, check the installation manual for your unit or download it from Midea UK's downloads page.
E-Series Error Codes
E-codes cover communication faults, sensor issues, and fan motor problems.
| Code | Meaning | What It Means and What to Do |
|---|---|---|
| E0 | EEPROM parameter error | The memory chip on the circuit board has corrupted data. Try a full power reset first (off at the isolator for 10 minutes). If it returns, the board needs replacing. |
| E1 | Indoor/outdoor communication error | The units cannot talk to each other. Check all cable connections between indoor and outdoor units. Look for loose terminals, damaged cables, or water ingress at connection points. |
| E2 | Zero-crossing signal error | An electrical timing fault on the PCB. This is a board-level issue that needs a technician. |
| E3 | Indoor fan speed out of control | The fan is running at the wrong speed or not responding to commands. Check for physical obstructions in the fan barrel first. If clear, the fan motor or control board is faulty. |
| E4 | Indoor temperature sensor (T1) fault | The room temperature sensor has an open or short circuit. Check the sensor connector is properly seated. If the sensor itself has failed, it is an inexpensive replacement. |
| E5 | Outdoor temperature sensor fault | The outdoor ambient or evaporator coil outlet sensor has failed. Located on the outdoor unit, so needs an engineer to access. |
| E6 | Indoor coil temperature sensor fault | The indoor evaporator coil sensor is open or short circuit. Check the connector first. Sensor replacement is straightforward. |
| E7 | Outdoor fan speed fault / display board error | The outdoor fan is running erratically, or the display board cannot communicate with the main board. Depends on the model. |
| E8 | Outdoor fan speed outside normal range | The outdoor fan motor is faulty or its speed controller has failed. |
| E9 | Indoor/outdoor communication error | Same as E1 on some model ranges. Check wiring between units. |
| EA | EEPROM parameter error (newer models) | Same as E0 on newer units. Memory chip fault. |
| Eb | Display board communication error | The display board and main control board cannot communicate. Internal wiring or board fault. |
| EC | Refrigerant leak detected / low refrigerant | The system has detected insufficient refrigerant. This needs an F-Gas certified engineer to find the leak, repair it, and recharge the system. |
| Ed | Frosting protection / adapter board error | Either the unit is protecting itself from frost buildup (clean the filters and check airflow), or the outdoor adapter board has a communication fault. |
F-Series Error Codes
F-codes cover sensor faults, current overload, and mechanical component issues.
| Code | Meaning | What It Means and What to Do |
|---|---|---|
| F0 | Current overload protection | The system is drawing too much current. Could be a dirty outdoor coil restricting airflow, an electrical supply fault, or compressor strain. Check the breaker first, then clean the outdoor coil. |
| F1 | Indoor/outdoor temperature sensor fault | A temperature sensor has an open or short circuit. Needs diagnosis to identify which sensor. |
| F2 | Evaporator coil outlet sensor fault | The sensor at the evaporator coil outlet has failed. |
| F3 | Outdoor temperature sensor fault | The outdoor ambient temperature sensor is open or short circuit. |
| F4 | Outdoor EEPROM error | The memory chip on the outdoor unit's control board has failed. Board replacement needed. |
| F5 | Outdoor fan speed fault | The outdoor fan motor or its speed controller has failed. |
| F6 | Outdoor sensor fault (alternate) | A secondary outdoor sensor has failed. |
| F7 | Lifting panel communication error | On models with a motorised front panel, the panel controller cannot communicate with the main board. |
| F8 | Lifting panel malfunction | The motorised panel has a mechanical or electrical fault. Check for physical obstructions first. |
| F9 | Lifting panel not closed | The front panel has not returned to the closed position. Check if something is blocking it. |
P-Series Error Codes
P-codes relate to power electronics, compressor protection, and pressure faults. Most of these are serious and need professional attention.
| Code | Meaning | What It Means and What to Do |
|---|---|---|
| P0 | IPM/IGBT overcurrent protection | The power module has detected excessive current. Could be a compressor issue, short circuit, or board failure. Switch off immediately and call an engineer. |
| P1 | Over-voltage or under-voltage protection | The incoming power supply voltage is too high or too low. Check your supply with a multimeter. On portable units, P1 can also mean the bottom drain tray is full and needs emptying. |
| P2 | Compressor overheating protection | The compressor or its power module is overheating. Needs professional diagnosis. |
| P3 | Compressor current protection | The compressor is drawing too much current. Possible compressor failure or electrical fault. |
| P4 | Inverter compressor drive error | The inverter cannot properly drive the compressor. Board or compressor fault. |
| P5 | Mode conflict / inverter protection | In multi-split systems, the indoor units are set to conflicting modes (one heating, one cooling). Set all units to the same mode. On single splits, this indicates inverter or condenser protection. |
| P6 | High/low pressure protection | Refrigerant pressure is outside the safe range. This involves the sealed refrigerant system and must be handled by an F-Gas certified engineer. |
| P7 | Compressor drive protection / WiFi AP mode | Compressor protection has activated, or the unit is showing "AP" for WiFi setup mode (not a fault, just informational). |
| PF | PFC module protection | The power factor correction circuit has triggered its protection. Board-level fault. |
Cassette and Ceiling Unit LED Indicator Codes
Midea cassette and ceiling/floor units use LED flash patterns instead of alphanumeric codes. The four indicator LEDs (Operation, Timer, Defrost, Alarm) flash in combinations:
| Operation | Timer | Defrost | Alarm | Meaning |
|---|---|---|---|---|
| Flashing | Off | Off | Off | Indoor room temperature sensor fault |
| Off | Off | Flashing | Off | Indoor pipe temperature sensor fault |
| Off | Flashing | Off | Off | Indoor/outdoor communication error |
| Off | Off | Off | Flashing | Water level alarm (condensate overflow) |
| Flashing | Flashing | Off | Off | EEPROM error |
Non-Error Display Codes
These codes appear on the display during normal operation and are not faults:
| Display | Meaning |
|---|---|
| AP | WiFi setup mode is active. Not a fault. |
| cF | Anti-cold air feature. The unit is warming up before blowing air in heating mode. |
| CL | Clean filter reminder. Remove and wash the filters. |
| dF | Defrost cycle in progress. The outdoor unit is melting ice from the coil. Normal in heating mode. |
| FP | Frost protection. The unit is heating to keep the room above 8C. |
| SC | Self-clean feature is running. |
Troubleshooting Steps Before Calling an Engineer
Many Midea error codes can be resolved with basic checks:
- Full power reset - Switch the unit off at the isolator (not the remote), wait 10 minutes, then switch it back on. This clears temporary sensor glitches and resets the control board.
- Clean the filters - Pull out the indoor unit filters, wash them under warm water, let them dry fully, and refit. Blocked filters cause restricted airflow, which triggers frosting (Ed), overheating (F0), and temperature sensor errors.
- Check the outdoor unit - Clear any leaves, debris, or objects blocking the outdoor unit. Make sure there is at least 300mm of clear space around it for airflow.
- Check drain lines - If you see water leaking from the indoor unit alongside an error code, the condensate drain is blocked. Use a wet vacuum or compressed air to clear it.
- Check power supply - If you see P1 (voltage protection), check your main supply. Voltage dips during peak demand can trigger this code. If it happens frequently, consider a voltage stabiliser.
When to Call a Professional
Do not attempt to fix these types of fault yourself:
- Refrigerant codes (EC, P6) - Only F-Gas certified engineers can legally handle refrigerants in the UK. Attempting DIY refrigerant work is illegal and dangerous.
- Compressor and power module codes (P0, P2, P3, P4, F90) - These involve high-voltage components. Switch off at the isolator and call a qualified technician.
- Repeated errors after reset - If the same code keeps returning, there is a root cause that needs proper diagnosis with refrigerant gauges and electrical testing equipment.
UK Regulations for Midea AC Systems
Midea air conditioning systems in the UK are subject to:
- F-Gas Regulation - Midea systems using R32 or R410A refrigerant require regular leak checks. See the UK Government F-Gas guidance for frequencies based on your system's CO2 equivalent charge.
- TM44 Inspections - Systems over 12kW combined cooling capacity need inspection every five years. Details at UK Government air conditioning inspections.
Official Midea Resources
- Midea UK - Official UK product pages, technical documentation, and support.
- Midea UK Downloads - Installation manuals and technical datasheets for all UK models.
- Midea High Wall Error Codes PDF - Official error code and fault diagnosis document for high wall systems.
Written by
Ali Elm
Ali is the Head of Operations at Be Cool Refrigeration with over a decade of hands-on experience in HVAC and commercial refrigeration. He oversees every installation, repair, and maintenance project, making sure the work meets the highest standards. Ali holds full F-Gas certification and has worked across residential, commercial, and industrial refrigeration systems throughout London and the South East. When he is not on site, he writes these guides to help business owners and homeowners understand their cooling systems better.