Midea MFA-76CRN1, Technical Manual

Page: 118 / 166

Troubleshooting R410A Tropical Split Type Technical Manual
118
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 PCB
No
Judge 3: Check whether the outdoor ambient temperature is too high
Yes
Stop the unit
No
Judge 4: Check whether the outdoor unit is bad ventilation
Yes
Make the outdoor unit ventilate well
No
Judge 5: Check whether the heat exchanger is dirty
Yes
Clean the heat exchanger
No
Judge 6: Check whether the refrigerant pipe is blocked
Yes
Drop refrigerant, then use the high
pressure nitrogen or refrigerant to
blow pipe, vacuumize and add the
refrigerant again