Si20-701_B Troubleshooting by Remote Controller
384
Remote Controller Display
U4
Applicable Models
RZQ-K/H, RZR-KU/HU
Error Decision Conditions
The error is generated when the micro-processor detects
that the transmission between the indoor unit and the
outdoor unit is not normal over a certain amount of time.
Supposed Causes
îš„ Wiring indoor-outdoor transmission wire is incorrect
îš„ Defective indoor unit PCB
îš„ Defective outdoor unit PCB
îš„ Burning out fuse
îš„ Defective fan motor
îš„ External factor (Noise, etc.)
Troubleshooting
Diagnosis of incorrect or broken/disconnected wiring. If
the LEDs on the indoor unit PCB are OFF, it indicates
that the transmission wiring between indoor and outdoor
units may be incorrect or broken/disconnected.
YES
A
NO
Field factor
Is the
power supply
voltage 415 VAC
between terminal
L3 and N?
Is
there a
wrong wiring
type, loose terminal
or contact failure in the
transmission wiring
between the indoor
and outdoor
units?
YES
NO
Wire correctly
and securely
fasten the
terminal screws.
Caution
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
may be damaged.
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