In brief
Fault code E4 on Gree livo gen4 service manual 9mbh 24mbh a means: The E4 fault code indicates discharge gas overheat protection when the temperature exceeds 115°C. The system stops automatically to prevent compressor damage. Most common cause: The main cause is an excessive compressor discharge temperature (above 115°C), often due to a refrigerant shortage, blocked pipework, capacity overload or ventilation problems. First action: Restart the unit and check whether the compressor discharge temperature is equal to or above the set point.. Call a registered engineer if the fault returns after basic checks or involves refrigerant work (F-Gas registered engineer required).
According to the Gree service manual, the E4 code activates discharge gas overheat protection when the temperature measured by the sensor exceeds 115°C.
E4 • Gree • livo gen4 service manual 9mbh 24mbh a
Gree E4 fault code: causes, diagnosis and solution
The E4 fault code indicates discharge gas overheat protection when the temperature exceeds 115°C. The system stops automatically to prevent compressor damage.
Source: Gree documentation (service manual – according to product reference)
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What does fault code E4 on Gree mean?
The E4 fault code indicates discharge gas overheat protection when the temperature exceeds 115°C. The system stops automatically to prevent compressor damage.
The main cause is an excessive compressor discharge temperature (above 115°C), often due to a refrigerant shortage, blocked pipework, capacity overload or ventilation problems.
Symptômes
- E4 fault code displayed on the outdoor unit main PCB LED screen.
- Automatic shutdown of the air conditioning system.
- Inability to restart automatically after several successive trips.
- Need to manually switch off the unit before restarting.
Diagnostic
1. Check temperature and sensors
- Restart the unit and check whether the compressor discharge temperature is equal to or above the set point.
- If the temperature is normal, check the resistance of the discharge temperature sensor; replace it if abnormal.
2. Check main PCB and compatibility
- If the sensor is good, replace the outdoor unit main PCB.
- Check whether the indoor unit capacity is compatible with the outdoor unit capacity.
3. Check the refrigeration system
- Check whether the ambient temperature exceeds the permitted operating range.
- Inspect the refrigerant pipes for any leaks and add refrigerant if necessary.
How to reset fault code E4 on Gree?
After identifying the cause (faulty sensor, main PCB, refrigerant shortage or blockage), carry out the corresponding repair. If the sensor is good, replace the main PCB. Then check capacity compatibility, ambient temperature and the integrity of the refrigeration circuit. Once corrections have been made, restart the unit manually.
When should you call an F-Gas engineer?
This code occurs during compressor operation when the discharge gas temperature exceeds the safety threshold of 115°C. It may manifest as a sudden unit shutdown or repeated malfunction preventing automatic restart, requiring technical intervention to reset.
Affected models
- Gree Flexx AC BH
- Gree Flexx Eco
- Gree Flexx Ultra R32
- Gree Livo Gen4 (9MBH/24MBH)
Field context
This code occurs during compressor operation when the discharge gas temperature exceeds the safety threshold of 115°C. It may manifest as a sudden unit shutdown or repeated malfunction preventing automatic restart, requiring technical intervention to reset.
Technical source data
The E4 code activates discharge gas overheat protection when the temperature measured by the sensor (discharge pipe and upper crankcase sensor) exceeds 115°C (Extract 4, 6, 8). The system stops automatically. If the sensor closes within minutes of shutdown, restart is automatic; otherwise, a manual power-off is required before restart (Extract 1, 2, 3). Causes include: service valves not open, faulty fans, blocked filters, excessive ambient temperature, refrigerant shortage or blocked pipework (Extract 6, 8). The troubleshooting procedure prioritises checking the actual temperature, then testing the sensor resistance (replace if abnormal), the main PCB (if sensor good), capacity compatibility, ambient temperature, and finally checking for leaks or blockages (Extract 5, 7).
Sources: flexx service manual ac bh — flexx-service-manual-ac-bh.pdf (p. 10) · flexx eco service manual a — flexx-eco-service-manual-a.pdf (p. 12) · flexx ultra r32 service manual a — flexx-ultra-r32-service-manual-a.pdf (p. 11)
Questions fréquentes
Does the system restart automatically after an E4 code?
The system attempts to restart automatically if the discharge temperature sensor closes (normalises) within a few minutes of shutdown. However, if the E4 code occurs several times within a given period, automatic restart is blocked. It is essential to switch the unit off manually before powering it back on to avoid an error loop (Extract 1, 2).
What is the first diagnostic step for an E4 code?
The first step is to restart the unit and check whether the faulty compressor discharge temperature is actually equal to or above 115°C. If the temperature is correct, then test the resistance of the discharge temperature sensor. If it is abnormal, replace the sensor; if normal, replace the outdoor unit main PCB (Extract 5, 7).
What are the common mechanical or installation causes?
Causes include: service valves (ODU/IDU) not fully open, faulty outdoor or indoor fans, blocked filters or air ducts, ambient temperature exceeding the permitted range, refrigerant shortage due to a leak, or blocked system pipework (Extract 6, 8).
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