170
TROUBLESHOOTING
Error code
Contents Error detection / Judgment
RC
display
Outdoor control PCB
Code Sub code
UF 24 n (Air net
address)
Refrigerant system is not set /
Improper wiring
Indoor unit system has no outdoor unit setting.
For example, indoor unit is connected to outdoor - outdoor unit
line. (Indoor unit detection)
UH - - System failure Communication address of indoor unit is not found between
initial power ON and completion of automatic address setting.
(Indoor unit detection)
U0 88 5 Refrigerant empty The following conditions are detected at outdoor unit starting
operation (before engine starting).
1. Refrigerant high pressure is lower than 44 psi (0.30 MPa).
AND
2. Refrigerant low pressure is lower than 12 psi (0.08 MPa).
6 Inadequate refrigerant After starting defrost operation status, 90 seconds later, com-
pressor discharge temperature sensor detects 212
℉ (100℃) or
higher.
U4 - - Transmission failure between
indoor and outdoor units
The indoor unit detects indoor - outdoor unit transmission
failure.
U5 1 n (Air net ad-
dress)
Remote controller - indoor unit
transmission failure
The remote controller - indoor unit transmission failure is detect-
ed.
U7 3 96 External control adapter failure
is received
A failure occurs in the external control adapter, and the failure
is received from the external control adapter.
(Master outdoor unit detection)
4 0 Communication failure between
outdoor units 1
<Communication failure>
The transmission is interrupted for 10 seconds in the following
time period.
1. During automatic address setting under combined installa-
tion.
Master: From decision signal transmission for automatic
address setting start to automatic address setting completion.
Dependent: From confirmation signal transmission for auto-
matic address setting decision to automatic address setting
completion
2. During usual transmission under combined installation.
Master: Always.
Dependent: Always after receiving usual transmission from
the master unit.
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