Troubleshooting for Outdoor Unit SiAU18-715
396 Troubleshooting
7.33 Excessive Number of Indoor Units
Remote
Controller
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
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
Push and hold the RESET
button on the outdoor unit
PC board for 5 seconds.
Does a
malfunction occur?
Is the
outdoor P.C. board
replaced to spare parts
PC board?
Does the
refrigerant type of
indoor and outdoor
unit match?
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.
Replace outdoor unit PC
board (A1P).
(Q0582)
YES
NO
YES
YES
There are too many indoor
units within the same
refrigerant system.
NO
Normal
NO
Matches the refrigerant
type of indoor and outdoor
unit.
NO
YES
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