P3: Compressor Current Protection - Midea Mini VRF Technical & Service Manual

R410A All DC Inverter Mini VRF

4.11 P3: Compressor current protection

It will protect when input current is more than 15A. It will recover when input current is less than 15A.
It will recover automatically.
Judge 1: check whether the input current of the power wire is
Check cooling system is normal or not.
Judge 2: Check whether the outdoor ambient temperature is
Judge 3: check whether the outdoor unit ventilates well.
`
Judge 4: whether the heat exchanger needs cleaning or not.
Judge 5: if the refrigerant pipe is blocked or not?
72
LED displays P3
Input current protection
more than 15A.
YES
too high.
NO
NO
NO
NO
Replace the outdoor PCB.
YES
YES
Make the outdoor unit
YES
Clean heat exchanger.
Remove the refrigerant pipe and then use
YES
high pressure nitrogen or refrigerant to blow
the pipe. Vacuume the pipe then add the
refrigerant again.
MCAC-VTSM-2016-02
Stop the unit.
ventilates well.
Troubleshooting