SiBE18-821_C Troubleshooting for Outdoor Unit
Troubleshooting 417
7.30 Excessive Number of Indoor Units
Remote
Controller
Display
UA
Method of
Malfunction
Detection
îš„
A difference occurs in data by the type of refrigerant between indoor and outdoor units.
îš„
The number of indoor units is out of the allowable range.
îš„
Incorrect signals are transmitted among the indoor unit, BP unit, and outdoor unit.
Malfunction
Decision
Conditions
The malfunction decision is made as soon as either of the abnormalities is detected.
Supposed
Causes
îš„
Excess of connected indoor units
îš„
Defective main PCB (A1P)
îš„
Mismatching of the refrigerant type of indoor and outdoor unit.
îš„
Setting of outdoor unit PCB was not conducted after replacing to spare parts PCB.
Troubleshooting
Push and hold the RESET
button (BS5) on the service
PCB (A2P) for 5 seconds.
Does a
malfunction occur?
Is the
outdoor unit PCB
replaced to spare parts
PCB?
Does the
refrigerant type of
indoor and outdoor
unit match?
The
total
number of
indoor units
displaying "
UA" and
indoor units connected to the
same refrigerant system
is within
connectable
number of
unit?
Caution
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
The refrigerant
classification has not been
set yet.
Replace the main PCB
(A1P).
(R13050)
YES
NO
YES
YES
There are too many indoor
units within the same
refrigerant system.
NO
Normal
NO
Match the refrigerant type
of indoor and outdoor unit.
NO
YES
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