Kaisai KOU-12HDN1 Service Manual page 117

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