Midea MIV V4+ Mini Service Manual page 41

DM12-01.01.05en
8) P2 malfunction
Low pressure protection
Judge 1: The wiring between the low pressure switch and
main control board is connected well or correctly
Judge 2: Whether the low pressure switch is broken
Validate: Short connect the low pressure switch
socket, check whether the system can run normally
Check whether the refrigerant system is ok
Judge 3: Check whether the outdoor ambient temperature is too low
Judge 4: The refrigerant of the system is leakage
Validate: Connect the pressure gauge to the gauge joint
of the system, check whether the pressure is lower than
0.15MPa
Judge 5: The refrigerant pipe is blocked
Replace outdoor main board
Outdoor units
LED indicates P2
Yes
No
No
No
No
MIV V4+ Mini DC Inverter R410A (220V, 8 kW)
No
Connect it well
Yes
Replace low pressure switch
Yes
Leak hunting: charge nitrogen or
refrigerant to the system, if the leakage is
serious, there will be distinct gas leakage
Yes
"cici" sound; if the leakage is little, use
the suds(mixture of water and abluent is
also ok, if it can make bubble) or
electronic leak detector.
Drop refrigerant, then use the high pressure
Yes
nitrogen or refrigerant to blow pipe, vacuumize
and add the refrigerant again
Stop the unit
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