Midea 9V SERIES - 9.2 Error Diagnosis Continued; 9.2.4 E4 Over Current Protection; 9.2.5 E5;E6 Sensor Errors

41
9.2.4 E4 (Over current protection occurs 4 times)
No
yes
↓
↓
↓
No
yes
yes
→
→
→
→
No
→
→
yes
→
correct the operation
condition
Replace the
capillary
Evacuate the refrigerant
system and recharge gas
Replace the
comprssor
There is some mixed inside
the refrigerant system
Check if the capillary
is blocked
Check if the compressor
is normal ?
Turn on the units and check if the
problem remains
Repair the power
supply
The power supply is
problematic
Disconnect with the power and
replace the main PCB
Check if the operation condition
is normal, especially the outdoor
unit?
Check if the voltage of power
supply is too low
Current
protection
9.2.5 E5/E6 (Open or short circuit of temperature sensor) diagnosis and solution.
YES
Replace outdoor PCB
YES
Check the connections between the
sensors and the PCB. Are the
connections good?
Replace the sensor and check if the
errors happen again?