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Troubleshooting by Indication on the Remote Controller
SiUS28-902_a
127
Troubleshooting
3.33 “
LC
” Outdoor Unit: Malfunction of Transmission
between Inverter and Control P.C.B.
Remote
Controller
Display
LC
Applicable
Models
RZQ18~30PVJU
Method of
Malfunction
Detection
Check the communication state between inverter P.C.B. and control P.C.B. by micro-computer.
Malfunction
Decision
Conditions
When the correct communication is not conducted in certain period.
Supposed
Causes
Malfunction of connection between the inverter microcomputer and outdoor control
microcomputer
Defect of outdoor unit P.C.B.
Defect of noise filter
External factor (Noise etc.)
Troubleshooting
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 co
u
ld
b
e damaged.
Is "
E7
"
displayed on the remote
controller? (not "
LC
")
Disconnect the connection for
the fan motor, and t
u
rn on
again.
Replace the o
u
tdoor
u
nit P.C.B.
(A1P).
Replace the fan motor.
Fail
u
re of the in
v
erter
transmission occ
u
rs d
u
e to the
fan motor malf
u
nction.
YES
YES
N
O
Is the
connector for the
fan motor properly
connected to the indoor
u
nit P.C.B.?
Connect correctly.
N
O
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