Digital Display Output Codes
The following error codes may be displayed on the digital interface of Midea HVAC units:
E3E4E5E7EbEdEFEPEUF9FbFd
Description of Error Codes
- E3: Combined water outlet temperature sensor error.
- E4: Water outlet temperature sensor error.
- 1E5: Air side heat exchanger refrigerant outlet temperature sensor T3A error.
- E7: Outdoor ambient temperature sensor error.
- 2Eb: Water side heat exchanger anti-freezing temperature sensor Taf2 error.
- 1Ed: Discharge pipe temperature sensor of system A error.
- 2Ed: Discharge pipe temperature sensor of system B error.
- EF: Water inlet temperature sensor error.
- EP: Discharge pipe temperature sensor failure alarm.
- EU: Air side heat exchanger refrigerant total outlet temperature sensor Tz/7 error.
- 1F9: Inverter module temperature sensor (Tfin1) error.
- 2F9: Inverter module temperature sensor (Tfin2) error.
- Fb: Pressure sensor error.
- Fd: Air suction temperature sensor error.
When these errors occur, the unit will stop running. The error code is displayed on the main PCB and the user interface.
Possible Causes
- Temperature sensor or pressure sensor are not connected properly or are malfunctioning.
- Damaged main PCB.
Troubleshooting Procedure
Follow these steps for error codes E3, E4, E5, E7, Eb, Ed, EE, EF, EP, EU, Fb, F9, Fd:
Check the connection of the temperature sensor or pressure sensor on the main PCB.
If the connection is loose: Ensure the sensor is connected properly.
If the connection is not loose: Proceed to the next step.
Check if the temperature or pressure sensor has short-circuited or failed.
If the sensor has short-circuited or failed: Replace the sensor.
If the sensor has not short-circuited or failed: Replace the main PCB.
Notes:
- For 30kW and 60kW units, all sensors are connected to ports CN1, CN16, CN31, CN3, CN10, and CN69 on the main PCB.
- Measure sensor resistance. If the resistance is too low, the sensor has short-circuited. If the resistance is not consistent with the sensor's resistance characteristics table, the sensor has failed. Refer to the “Temperature Sensor Resistance Characteristics” document for details.
