Troubleshooting by Remote Controller Si20-701_B
391
Remote Controller Display
U4
or
UF
Applicable Models
RZQ(S)-B/C
Error Decision Conditions
The error is generated when the micro-processor detects
that the transmission between the indoor and the outdoor
unit is not normal over a certain amount of time.
Supposed Causes
Wiring indoor-outdoor transmission wire is incorrect
Defective indoor unit PCB
Defective outdoor unit PCB
Burning out fuse
Defective fan motor
External factor (Noise, etc.)
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