MLCAC-UTSM-2010-10 Troubleshooting
Outdoor Units 85
4. E3 malfunction (For 36K & 48K & 60K)
E3 display
Communication malfunction in outdoor IC and DSP
Check whether the indicator lights LED1 or LED2 on the main control
board are flashing
Replace PCB
Yes
Install the IC-U3 chip of the PCB over again, check whether the system
can run normally
Trouble is solved
Yes
No
Check whether the output of the transformer to CN4 socket is well
No
Replace PCB
Yes
No
Replace the transformer
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