Midea MIV V4+ Mini Service Manual page 36

MIV V4+ Mini DC Inverter R410A (220V, 8 kW)
3) E3 malfunction
LED indicates E3
Communication malfunction in outdoor PCB
Check whether the indicator lights LED1 or LED2 on the
main control board are flashing
Install the IC-U3 chip of the PCB over again, check
whether the system can run normally
Check whether the output of the transformer to CN4 socket
is well
Replace the transformer
34
No
No
No
Yes
Replace PCB
Yes
Trouble is solved
Yes
Replace PCB
DM12-01.01.05en
Outdoor units