Troubleshooting MCAC-UTSM-2008-05
58 Outdoor Units
9.2 Outdoor unit malfunctions:
12000Btu/h: Its malfunctions are displayed on the indoor units’ indicator.
18000Btu/h: Its malfunctions are displayed on the outdoor units’ digital tube.
Display Malfunction or Protection
E0 EEPROM malfunction
E2 Communication malfunction between indoor/outdoor units
E3 Communication malfunction in outdoor PCB
E4 Outdoor temperature sensors malfunction
E5 Compressor voltage protection
P1 High pressure protection
P2 Low pressure protection
P3 Compressor current protection
P4 Compressor discharge temperature protection
P5 Condenser high temperature protection
P6 IPM protection
1. E0 malfunction
LED indicates E0
EEPROM malfunction
Check whether the EEPROM is inserted well
Yes
No
Insert the EEPROM well
Replace outdoor main board
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