Midea MGA-D10/N1 Manual page 40

MCAC-UTSM-2008-11
P1: High pressure protection
LED indicates P1
High pressure protection
Judge 1: Whether the wiring between the high
pressure switch and main control board is connected
well and 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
Judge 3: Whether the air exhaust temperature
controller gets faulty
Check whether the refrigerant system is ok
Judge 4: Check whether the outdoor ambient
temperature is too high
Judge 5: Check whether the outdoor unit is bad
ventilation
Judge 6: Check whether the heat exchanger is dirty
Judge 6: Check whether the refrigerant pipe is
Replace outdoor main board
Outdoor Unit
Yes
No
No
No
No
No
blocked
No
No
Connect it well
Yes
Replace high pressure switch
Yes
Replace air exhaust temperature controller
Yes
Yes
Make the outdoor unit ventilate well
Yes
Clean the heat exchanger
Drop refrigerant, then use the high pressure
Yes
nitrogen or refrigerant to blow pipe,
vacuumize and add the refrigerant again
Troubleshooting
Stop the unit
39