Midea MIV V4+ Mini Service Manual page 42

MIV V4+ Mini DC Inverter R410A (220V, 8 kW)
9) P3 malfunction
Outdoor unit current protection
Judge 1: Check whether the input current of the power supply
wire is more than 15A
Check whether the refrigerant system is ok
Judge 2: Check whether the outdoor ambient temperature is too high
Judge 3: Check whether the outdoor unit is bad ventilation
Judge 4: Check whether the heat exchanger is dirty
Judge 5: The refrigerant pipe is blocked
Replace outdoor main board
40
LED indicates P3
Yes
No
No
No
No
Replace the filter board,
No
then check whether the
system can run normally
No
Replace outdoor PCB
Yes
Yes
Make the outdoor unit ventilate well
Yes
Clean the heat exchanger
Yes
Drop refrigerant, then use the high pressure
nitrogen or refrigerant to blow pipe,
vacuumize and add the refrigerant again
DM12-01.01.05en
Yes
Trouble is
solved
Stop the unit
Outdoor units