Troubleshooting by Indication on the Remote Controller
SiUS28-902_B
146
Service Diagnosis
3.44 System is not Set yet
Remote
Controller
Display
UF
Applicable
Models
FCQ, FHQ, FAQ, FTQ
RZQ18~30PVJU
Method of Error
Detection
On check operation, the capacity of indoor units in terms of transmission is not corresponding to
that of indoor units that have made changes in temperature.
Error Decision
Conditions
The error is determined as soon as the abnormality aforementioned is detected through
checking the system for any erroneous connection of units on the check operation.
Supposed
Causes
Improper connection of transmission wiring between indoor-outdoor units
Failure to execute check operation
Defective indoor unit PCB
Stop valve is left in closed
Troubleshooting
Note:
Wiring check operation may not be successful if carried out after the outdoor unit has been off
for more than 12 hours, or if it is not carried out after running all connected indoor units in the
fan mode for at least an hour.
Caution
Be s
u
re to t
u
rn off the po
w
er s
w
itch
b
efore connecting or disconnecting
the connector or parts may
b
e damaged.
Is indoor - o
u
tdoor
u
nit transmission
w
iring normal?
Replace the indoor
u
nit PCB.
W
iring check operation may
not ha
v
e
b
een carried o
u
t
s
u
ccessf
u
lly.
After fixing incorrect
w
iring,
press and hold the RESET
bu
tton on the master o
u
tdoor
u
nit PCB for 5 seconds.
*
The
u
nit
w
ill not r
u
n for
u
p to
12 min
u
tes.
YES
N
O
YES
N
O
N
O
YES
Is the check operation
carried o
u
t?
Is indoor-o
u
tdoor
u
nit
transmission
w
iring
normal?
Open the stop
v
al
v
e.
YES
N
O
Are the stop
v
al
v
es
opened?
