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Troubleshooting by Remote Controller
Si20-701_B
387
NO
NO
Does error
"
U4
" or "
UF
" reoccur?
YES
Replace the
outdoor unit
inverter PCB.
YES
Replace the
indoor unit PCB.
External factor
(Noise, etc.)
B
D
The error is
displayed again.
After turning OFF the
power supply, correctly
insert the connector of the
fan motor and then restore
the power.