The Ultimate Midea Air Conditioner Error Code Guide (2026 Edition)

Is your Midea air conditioner flashing a cryptic combination of letters and numbers instead of cooling your room? These error codes are built-in diagnostic tools designed to tell you exactly what is wrong with the system, from a simple dirty filter to a complex communication failure.

Because Midea produces a wide range of systems—including residential split units, multi-inverters, and commercial water-based heat exchangers—a single code can sometimes mean different things depending on your specific model. This guide provides the most comprehensive breakdown of Midea error codes to help you troubleshoot like a pro.

Quick Search: Midea Error Code Lookup

Use this section to identify your code quickly. If you are an advanced user, you can integrate this data into a custom interactive script.

E-Series Error Codes (System & Sensor Protections)

The “E” codes generally point to temperature sensor failures, pressure protections, or communication errors.

Error Code	Description / Meaning	Possible Causes & Troubleshooting
E1	High Pressure Protection.	Excessive pressure in the refrigerant system. Ensure the outdoor unit has proper airflow, check for blocked condenser coils, and inspect for refrigerant overcharge.
E2	Split Units: Indoor ambient temperature sensor error. Multi/Inverter Units: Indoor Anti-freeze Protection.	Sensor Error: The temperature sensor is not connected correctly or is faulty. Check the connection on the main PCB or replace the sensor/PCB. Anti-freeze: Evaporator coil temperature is too low. Ensure filters are clean, airflow is unobstructed, inspect refrigerant levels, and allow the unit to defrost.
E3	Split Units: Indoor heat exchanger midpoint temperature sensor error. Multi/Inverter Units: Low Pressure Protection. Commercial/Water Units: Combined water outlet temperature sensor error.	Sensor Error: The sensor is loose, short-circuited, or failed; reconnect or replace the sensor or main PCB. Low Pressure: Low refrigerant pressure or leakage. Check for leaks, recharge refrigerant, and inspect the expansion valve.
E4	Split Units: Indoor heat exchanger outlet temperature sensor error. Multi/Inverter Units: Indoor Room Temperature Sensor Error. Commercial/Water Units: Water outlet temperature sensor error.	Sensor Error: Sensor is in open circuit, short-circuited, or poorly connected. Check the indoor thermistor and associated wiring, and replace the part if defective.
E5 / 1E5	Multi/Inverter Units: Overcurrent Protection. Commercial/Water Units (1E5): Air side heat exchanger refrigerant outlet temperature sensor T3A error.	Overcurrent: Excessive current in the system. Verify the voltage supply, inspect the compressor and wiring, and restart the unit. Sensor Error: Check for loose connection on main PCB, short-circuit, or failure; replace sensor or PCB.
E6	Communication Error.	Loss of communication between indoor and outdoor units. Check wiring connections, ensure no damage to communication cables, and restart the system.
E7	Outdoor ambient temperature sensor error.	Temperature sensor connection on main PCB is loose, short-circuited, or failed. Reconnect or replace the sensor/PCB.
E8	Power Phase Protector Fault.	Midea cassette aircon has an airflow or electrical issue. Check wiring connections, ensure no damage to communication cables or terminals, and restart the system.
Eb / 2Eb	Water side heat exchanger anti-freezing temperature sensor Taf2 error.	Sensor connection is loose, short-circuited, or failed.
Ed / 1Ed / 2Ed	Discharge pipe temperature sensor of system A error (1Ed) or system B error (2Ed).	Sensor connection is loose, short-circuited, or failed.
EF	Water inlet temperature sensor error.	Sensor connection is loose, short-circuited, or failed.
EP	Discharge pipe temperature sensor failure alarm.	Sensor connection is loose, short-circuited, or failed.
EU	Air side heat exchanger refrigerant total outlet temperature sensor Tz/7 error.	Sensor connection is loose, short-circuited, or failed.

When your Midea air conditioner displays an E-Series code, it is generally signaling a protection mode or a sensor failure. These codes are designed to prevent permanent damage to the compressor or electronic components.

Here is a step-by-step troubleshooting guide to help you move from a flashing error to a cooling room.

Step 1: The 10-Minute “Hard Reset”

Before opening any panels, perform a power cycle to clear temporary electronic glitches.

• Action: Turn off the air conditioner and switch off the main circuit breaker.
• Wait: Keep the power off for at least 10 minutes to allow the control board capacitors to discharge completely.
• Result: If the code was caused by a minor power surge or communication hiccup, the unit should restart normally.

Step 2: Identify the Fault Category

If the code returns immediately, categorize the error to determine your next move.

1. Pressure & Airflow Issues (E1, E3)

• E1 (High Pressure): Often caused by a dirty outdoor unit or blocked air path. Check that no objects are blocking the outdoor fan and clean the condenser coils.
• E3 (Low Pressure): Usually indicates a refrigerant leak. Look for oily residue around the copper pipe joints, which signals a gas leak.

2. Sensor Failures (E2, E3, E4, E7)

• Common Symptoms: The unit may start for a few seconds and then shut down.
• Quick Check: Ensure the sensor (thermistor) hasn’t slipped out of its housing on the copper pipe.
• Advanced Troubleshooting: Use a multimeter to check the sensor’s resistance. If the resistance is near zero (short circuit) or infinite (open circuit), the sensor is dead and must be replaced.

3. Communication Errors (E6)

• Action: Inspect the signal wire connecting the indoor and outdoor units.
• Watch For: Loose terminals, corroded wires, or damage from pests (like lizards or ants) that may have shorted the PCB.

Step 3: Technical Reference Table

Error Code	Primary Action	Technical Check
E1	Clean outdoor coils.	Check for refrigerant overcharge.
E2 / E4	Reconnect indoor sensors.	Replace faulty indoor thermistor.
E3	Inspect for gas leaks.	Check indoor midpoint sensor resistance.
E6	Tighten wiring terminals.	Check signal voltage between units.
E8	Verify power supply phase.	Check for airflow obstructions in cassettes.

Step 4: When to Call a Professional

While cleaning filters or resetting the breaker is safe for most users, some E-series repairs involve high-voltage electricity and specialized tools.

Contact a technician if:

• You suspect a refrigerant leak (E3), as this requires a vacuum pump and manifold gauges.
• The outdoor main PCB (E7, E6) needs replacement.
• The error involves Power Phase (E8), which requires testing your home’s electrical distribution.

Pro Tip: Always record the specific error code (and if it is flashing or static) before calling for service. This helps the technician bring the correct replacement sensors or boards on the first visit.

F-Series Error Codes (Outdoor Unit & Fan Faults)

The “F” codes predominantly relate to outdoor sensor faults, motor speed anomalies, and refrigerant leakage.

Error Code	Description / Meaning	Possible Causes & Troubleshooting
F0	Refrigerant Leakage.	Insufficient refrigerant due to leakage. Inspect for leaks, then repair and refill refrigerant.
F1	Indoor Ambient Sensor Fault.	Malfunctioning ambient temperature sensor. Replace the sensor and ensure proper sensor connection.
F2	Outdoor Temperature Sensor Fault (Condenser).	Condenser coil temperature sensor is in open circuit or has short circuited. Replace the sensor and ensure proper sensor connection.
F3	Outdoor Temperature Sensor Fault (Compressor).	Compressor discharge temperature sensor is in open circuit or has short circuited. Replace the sensor and ensure proper sensor connection.
F4	Outdoor unit EEPROM parameter error.	Contact a technician to reprogram or replace the EEPROM.
F5	Outdoor Fan Motor Speed Fault.	The outdoor fan motor speed is operating outside the normal range. Inspect the fan motor for defects and replace if necessary.
F6	Indoor Temperature Sensor Fault.	Evaporator coil outlet temperature sensor is in open circuit or has short circuited. Replace the sensor and ensure proper connection.
F9 / 1F9 / 2F9	Inverter module temperature sensor error (Tfin1 for 1F9, Tfin2 for 2F9).	Sensor connection on main PCB is loose, short-circuited, or failed.
Fb	Pressure sensor error.	Pressure sensor connection on main PCB is loose, short-circuited, or failed. Replace main PCB or the sensor.
Fd	Air suction temperature sensor error.	Sensor connection on main PCB is loose, short-circuited, or failed.

If your unit is flashing an “F,” follow this systematic guide to diagnose the issue.

Step 1: The External Obstruction Check

Before testing electrical components, ensure the outdoor unit can “breathe.” This is the most common cause for motor speed errors.

• Action: Inspect the outdoor fan for debris like dry leaves, twigs, or plastic bags.
• Check: Ensure the outdoor condenser fins are not matted with dust or pet hair, which can cause overheating and trigger sensor faults.
• Common Code: F5 (Outdoor Fan Motor Speed Fault).

Step 2: The “Freon” & Leak Protocol (F0)

The F0 code is one of the most critical. It indicates the system has detected a drop in refrigerant pressure.

• Safety Warning: Do not simply “top up” the gas. If the system shows F0, there is a physical hole or a loose joint that must be sealed first.
• Action: Look for oily spots on the copper piping or the cooling fins. Refrigerant carries oil; where there is a leak, there is usually a greasy residue.
• Fix: A technician must perform a pressure test, weld the leak, and perform a vacuum before recharging the system.

Step 3: Testing the Thermistors (F1, F2, F3, F6)

F-series sensors are “thermistors”—resistors that change value based on temperature.

• Identify the Sensor:
  • F1: Indoor Ambient Sensor.
  • F2: Outdoor Condenser Coil Sensor.
  • F3: Compressor Discharge Sensor.
  • F6: Indoor Coil Outlet Sensor.
• Testing: Use a multimeter to measure the Resistance ($\Omega$). If the sensor reads 0 $\Omega$ (short circuit) or $\infty$ (open circuit), it is defective and requires replacement.

F-Series Technical Breakdown

Error Code	Meaning	Troubleshooting Action
F0	Refrigerant Leakage	Inspect pipe joints for oil; requires leak repair and refill.
F1 / F6	Indoor Sensor Fault	Check connection on indoor PCB; replace thermistor if resistance is abnormal.
F2 / F3	Outdoor Sensor Fault	Inspect outdoor condenser/compressor sensors for corrosion or loose plugs.
F4	EEPROM Parameter Error	Usually requires a replacement of the outdoor main PCB.
F5	Outdoor Fan Motor Fault	Check for fan blade obstructions or a failed fan motor.
Fb / Fd	Pressure or Suction Error	Commercial units: Check pressure sensor connections on the main PCB.

Step 4: The Electrical “Brain” Check (F4)

If you see F4, the system’s memory (EEPROM) has corrupted.

• The Fix: This is rarely a DIY repair. It indicates the software on the outdoor control board has failed. A technician will need to either reprogram the chip or, more commonly, replace the entire outdoor PCB.

Pro-Tip for 2026 Maintenance

Modern Midea Inverter systems are highly sensitive to voltage “noise.” If you encounter multiple “F” codes simultaneously, check the grounding of your outdoor unit. A loose ground wire can cause “ghost” sensor errors that disappear once the electrical path is secured.

Need a hand with a stubborn F0 or F5 error? Use the lookup tool above or tap the WhatsApp button to speak with a technician who can run a manifold gauge test on your system.

P-Series & H-Series Error Codes (Electrical & Module Protections)

“P” and “H” codes indicate severe voltage protections, inverter malfunctions, or physical blockages like drainage and locked motors.

Error Code	Description / Meaning	Possible Causes & Troubleshooting
P0	IPM Malfunction.	Wiring defect or fault in the outdoor fan motor or compressor. Ensure proper ventilation and check outdoor PCB terminal and wiring.
P1	Voltage Protection.	Voltage fluctuations or abnormal supply. Stabilize power supply and install a voltage regulator if necessary.
P2	Water Drainage Issue.	Clog in the drain line. Empty the drain pan and remove clogs from the drain hose.
P4	Inverter Module Protection.	Overheating or malfunction of inverter module. Ensure proper ventilation and check inverter module for faults.
H6	Indoor Fan Motor Malfunction.	Faulty or locked indoor fan motor. Remove obstructions around the fan and replace the fan motor if necessary.

While the E and F series focus on sensors and environment, the P-Series and H-Series represent Protection and Hardware faults. These codes are often the system’s “emergency brakes,” triggered when the unit detects critical electrical anomalies or physical blockages that could lead to complete mechanical failure.

If your unit is flashing a “P” or “H” code, use this guide to determine if you need a screwdriver or a specialist.

Step 1: Clear Physical Blockages (P2 & H6)

These codes are often caused by tangible obstructions rather than electronic failures.

The P2 Drainage Protocol

The P2 error is one of the most common service calls, especially in humid climates. It signals that the water level in the internal drain pan has reached a critical limit.

• Action: Check the drain hose for “slime” or algae buildup.
• Fix: Use a wet/dry vacuum to clear the external drain pipe. If the code persists, the internal float switch may be stuck in the “up” position.

The H6 Fan Obstruction

H6 indicates the indoor fan motor is locked or malfunctioning.

• Action: Peer into the air outlet (while power is off). Look for objects like pens, toys, or excessive dust “clumps” pinning the fan blade.
• Check: Gently spin the fan with a long tool; if it resists or feels “gritty,” the bearings have failed and the motor requires replacement.

Step 2: Stabilize the Power Supply (P1)

The P1 code is a voltage protection error. Modern Midea inverters require a very stable electrical current to operate their high-frequency compressors.

• Action: Check if other high-draw appliances (like water heaters or ovens) were turned on when the error occurred.
• Fix: If your area is prone to “brownouts” or voltage spikes, consider installing a dedicated voltage stabilizer for the air conditioning circuit.

Step 3: Inverter & Module Diagnostics (P0 & P4)

These are “Module Protections.” The IPM (Intelligent Power Module) is the brain that converts your home’s power into the specific frequency needed for the compressor.

P0 & P4 Troubleshooting:

• Check Ventilation: If the outdoor unit is installed in a tight balcony or a “cage,” heat will build up, causing the Inverter Module to overheat (P4).
• Thermal Paste: For advanced users, P0 can sometimes be fixed by applying fresh thermal grease between the IPM and its heat sink on the outdoor PCB.
• Wiring: Ensure the compressor terminals are tight. A loose wire here creates “electrical noise” that trips the IPM protection.

Step 4: Verification of the PCB (Commercial Units)

For owners of larger Midea units (30kW+), these codes may relate to specific ports on the main control board.

• Action: If a “P” code persists after resets, a technician should verify connections at ports CN1, CN16, and CN31.
• Note: If the resistance across these ports is abnormal, the main PCB has likely suffered a component failure.

Pro-Tip: P-series errors can sometimes be “ghost codes” caused by high humidity affecting the outdoor electronics. If your unit is in a coastal or high-rain area, ensuring the outdoor unit’s electrical box is properly sealed can prevent these codes from appearing during storms.

Important Troubleshooting Notes for Readers

• Verify the Resistance: When diagnosing sensor errors (like E2, E3, or E4), measure the sensor resistance. If the resistance is too low, the sensor has short-circuited. If the resistance is not consistent with the sensor’s specific resistance characteristics table, the sensor has failed and must be replaced.
• Hard Reset: Sometimes, turning off the air conditioner and restarting it can clear minor errors.
• Port Connections: For larger 30kW and 60kW Midea units, sensors are connected to specific ports (CN1, CN16, CN31, CN3, CN10, and CN69) on the main PCB.

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