Midea M3OE-21HFN1-Q - 11.2 Outdoor unit error code explanation:

DM16-01.01.11-01en Service manual
Multi DC inverter R410A. Outdoor unit 35
Over voltage or over low voltage protection P1 ☆ 2
Too low ambient temperature protection P3 ☆ 4
Error rotor position protection of compressor P4 ☆ 5
Mode conflict P5 ☆ 6
Low pressure protection of compressor P6 ☆ 7
O (on) X(off) ☆(flash at 2Hz)
11.2 Outdoor unit error code explanation:
Display LED STATUS
E0 Outdoor EEPROM malfunction
E2 Indoor / outdoor units communication error
E3 Communication malfunction between IPM board and outdoor main board
E4 Open or short circuit of outdoor unit temperature sensor
E5 Voltage protection
E8 Outdoor fan speed has been out of control
F1 No A Indoor unit coil outlet temperature sensor or connector of sensor is defective
F2 No B Indoor unit coil outlet temperature sensor or connector of sensor is defective
F3 No C Indoor unit coil outlet temperature sensor or connector of sensor is defective
F4 No D Indoor unit coil outlet temperature sensor or connector of sensor is defective
F5 No E Indoor unit coil outlet temperature sensor or connector of sensor is defective
P1
High pressure protection (ForM4OE-28HFN1-Q, M4OB-36HFN1-Q, M5OE-42HFN1-Q)
P2 Low pressure protection (ForM4OE-28HFN1-Q, M4OB-36HFN1-Q, M5OE-42HFN1-Q)
P3 Current protection of compressor
P4 Temperature protection of compressor discharge
P5 High temperature protection of condenser
P6 IPM module protection
LP Low ambient temperature protection
Note: Once these error codes display, they will disappear in at least 30 seconds if the unit come back to
normal. (Except E2&E3)