Midea MFA-96CRN1 Technical Manual page 118

R410A 50Hz Tropical Split AC
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
Validate: Short connect the high 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 high
Judge 4: Check whether the outdoor unit is bad ventilation
Judge 5: Check whether the heat exchanger is dirty
Judge 6: Check whether the refrigerant pipe is blocked
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Yes
No
No
No
No
No
Replace outdoor PCB
No
Connect it well
Yes
Replace high pressure switch
Yes
Yes
Make the outdoor unit ventilate well
Yes
Clean the heat exchanger
Drop refrigerant, then use the high
Yes
pressure nitrogen or refrigerant to
blow pipe, vacuumize and add the
refrigerant again
MCAC-UTSM-2012-12
Stop the unit