SiUS28-902_B
Troubleshooting by Indication on the Remote Controller
Service Diagnosis
129
3.32 Momentary Overcurrent of Inverter Compressor
Remote
Controller
Display
L5
Applicable
Models
RZR, RZQ
Method of Error
Detection
The error is detected from current flowing in the power transistor.
Error Decision
Conditions
When overcurrent flows in the power transistor
(Instantaneous overcurrent also causes activation)
Supposed
Causes
Defective compressor coil (disconnected, defective insulation)
Compressor startup error (mechanical lock)
Defective inverter PCB
Troubleshooting
Higher voltage than actual is displayed when the inverter output voltage is checked by tester.
The
compressor
'
s coil is
disconnected or the
ins
u
lation is
defecti
v
e.
In
v
erter
o
u
tp
u
t
v
oltage
check if In
v
erter
o
u
tp
u
t
v
oltage is
im
b
alanced. (
N
ormal if
w
ithin
±
5
V
) M
u
st
b
e
meas
u
red
w
hen
fre
qu
ency is
sta
b
le.
There is an
instantaneo
u
s po
w
er
drop.
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.
Compressor inspection
Caution
Replace the compressor.
Compressor inspection
Inspect according to the diagnosis
proced
u
re for odd noises,
v
i
b
ration
and operating stat
u
s of the
compressor.
Replace the in
v
erter
u
nit.
Correct po
w
er s
u
pply.
Disconnect the connection
b
et
w
een the compressor and
in
v
erter. Make the po
w
er
transistor check mode setting
O
N
b
y ser
v
ice mode.
YES
N
O
YES
N
O
YES
N
O
