Midea MIV V4+ Mini, Service Manual

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MIV V4+ Mini DC Inverter R410A (220V, 8 kW) DM12-01.01.05en
38 Outdoor units
7) P1 malfunction
LED indicates P1
High pressure protection
Judge 1: Whether the wiring between the high pressure switch
and main control board is connected well or correctly
Judge 2: Whether the high pressure switch is broken
Yes
No
Connect it well
Validate: Short connect the high pressure switch
socket, check whether the system can run normally
Yes
Replace high pressure switch
No
Check whether the refrigerant system is ok
Replace outdoor main board
No
Yes
Stop the unit
No
Yes
Make the outdoor unit ventilate well
No
Yes
Clean the heat exchanger
No
Yes Drop refrigerant, then use the high pressure
nitrogen or refrigerant to blow pipe,
vacuumize and add the refrigerant again
Judge 6: Check whether the refrigerant pipe is
blocked
Judge 5: Check whether the heat exchanger is dirty
Judge 4: Check whether the outdoor unit is bad ventilation
Judge 3: Check whether the outdoor ambient temperature is too high