MLCAC-UTSM-2010-10 Troubleshooting
Outdoor Units 91
10.2 Outdoor unit malfunction
12k
Indoor Display Malfunction or Protection
LED6
(Green)
LED5
(Red)
P0 IGBT over-strong current protection
☆ X
P1 Voltage protection of compressor O O
P4 Indoor / outdoor units communication error ☆ ☆
O(light) X(off) ☆(flash at 2.5Hz)
18~60k
Display Malfunction or Protection
E0 EEPROM malfunction
E2 Communication malfunction between indoor IC and outdoor IC
E3 Communication malfunction in outdoor IC and DSP
E4 Malfunction of outdoor temperature sensor
E5 Voltage protection of compressor
E6 PFC module protection (Only for 30K, 36K & 48K with 1 phase)
P0 Top temperature protection of compressor
P1 High pressure protection
P2 Low pressure protection
P3 Current protection of compressor
P4 Discharge temperature protection of compressor
P5 High temperature protection of condenser
P6 Module protection
P7 High temperature protection of evaporator(Only for 36K ,48K & 60K)
In low ambient cooling mode, the LED displays“LC” or alternative displays between running frequency
and “LC”(each displays 0.5s)
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