MLCAC-UTSM-2010-10 Troubleshooting
Outdoor Units 87
6. E5 malfunction
7. E6 malfunction (Only for 30K, 36K & 48K with 1 phase)
E5 display
Voltage protection of compressor
Check the voltage of outdoor unit power supply, whether the voltage
between L(1) and N is about 172-265V
No
Replace the power board, then check whether the system can run normally
Check the power supply
Yes
Replace outdoor main board
Yes
Trouble is solved
No
E6 display
PFC module protection
Check whether the connecting line between main
board and the PFC module is connected tightly
No
Connect it tightly, check normal or not
Yes
Check whether the voltage between P
and N of IPM module is 380-390V
No
Yes
Replace the outdoor main board
No
Replace the PFC module
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