Midea MIV V4+ Mini Service Manual page 43

DM12-01.01.05en
10) P4 malfunction
When compressor discharge temperature is more than 115°C, the unit will stop, and unit runs again when
compressor discharge temperature is less than 90°C.
Compressor discharge temperature protection
Check whether the compressor discharge temp. more than 115°C ?
Check whether the wiring connection is right
between compressor discharge temp.
sensor and PCB according to wiring
diagrams
Judge: The discharge temp. sensor is broken
Validate: Check whether the resistance of compressor
discharge temp. sensor is right refer to the Annex 2
Replace outdoor main board
Outdoor units
LED indicates P4
No
Yes
Yes
MIV V4+ Mini DC Inverter R410A (220V, 8 kW)
No
Correct the wiring connection
Check whether the refrigerant is leakage
Stop leaking and add refrigerant
No
Replace the compressor
discharge temp. sensor
Yes
Yes
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