Troubleshooting for Outdoor Unit SiEN18-622
398 Troubleshooting
7.33 Excessive Number of Indoor Units
Remote Control
Display
UA
Applicable
Models
AII indoor unit models
Method of
Malfunction
Detection
Malfunction
Decision
Conditions
Supposed
Causes
Excess of connected indoor units
Defect of outdoor unit PCB (A1P)
Mismatching of the refrigerant type of indoor and outdoor unit.
Setting of outdoor PCB was not conducted after replacing to spare parts PCB.
Troubleshooting
∗ The number of indoor units that can be connected to a single outdoor unit system depends on
the type of outdoor unit.
Caution
(V3169)
Normal
NO
NO
YES
YES
NO
YES
Doesa malfunction occur?
NO
YES
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
Is the outdoor PC
board replaced to
spare parts PC
board?
Does the
refrigerant type of
indoor and outdoor unit
match?
Push and hold the RESET
button on the outdoor unit
PC board for 5 seconds.
The total
of indoor units
displaying “UA”and
indoor units connected to
the same refrigerant
system is within
connectable
number of
unit*
The refrigerant classification
has not been set yet.
There are too many indoor units
within the same refrigerant
system.
Matches the refrigerant type of
indoor and outdoor unit.
Replace outdoor unit PC board
(A1P).
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