Kaisai KOU-12HDN1 Service Manual page 119

MLCAC-UTSM-2010-10 Troubleshooting
6. E5 malfunction
E5 display
Voltage protection of compressor
Check the voltage of outdoor unit power supply, whether the voltage No
Check the power supply
between L(1) and N is about 172-265V
Yes
Yes
Replace the power board, then check whether the system can run normally
Trouble is solved
No
Replace outdoor main board
7. E6 malfunction (Only for 30K, 36K & 48K with 1 phase)
E6 display
PFC module protection
Check whether the connecting line between main
No
board and the PFC module is connected tightly
Connect it tightly, check normal or not
No
Yes
Yes
Check whether the voltage between P
and N of IPM module is 380-390V
Replace the outdoor main board
No
Replace the PFC module
Outdoor Units 115