10 Troubleshooting
Troubleshooting procedure
SMGB0136 rev.0 - 07/2021
241
10
Alarm code
04
Abnormal transmission between control PCB and inverter PCB in outdoor unit
- This alarm is displayed when the abnormal operation is maintained for 30 seconds after the normal transmission
between the outdoor unit PCB1 and inverter PCB2. Also, the abnormal operation is maintained for 30 seconds
after the micro-computer is automatically reset. The alarm is displayed when the abnormal transmission is
maintained for 30 seconds from the starting of the outdoor unit.
Replace fuse if blown
Yes
Turn ON the power supply
No
Faulty PCB or faulty DC fan
motor
Note: investigate the cause
of fuse blown
LED2 is ON or OFF
Is power fuse for
outdoor unit (PF1)
normal?
Yes
Is LED2 (green)
on PCB ON/OFF/
ashing?
ashing
PCB is normal
PCB1: Control PCB in outdoor unit
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