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SiUS28-902_B
Troubleshooting by Indication on the Remote Controller
Service Diagnosis
111
Troubleshooting
Note:
1: The quality of power transistors/ diode modules can be judged by executing
.
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.
Ens
u
re the correct connection.
Ens
u
re the correct connection.
Replace the compressor.
N
O
N
O
N
O
N
O
YES
N
O
YES
N
O
YES
N
O
N
O
N
O
YES
YES
YES
YES
Po
w
er OFF
Po
w
er O
N
YES
YES
U
V
W
Remo
v
e the connection
b
et
w
een
the compressor and in
v
erter. Set
the po
w
er transistor check mode
O
N
u
sing “Setting mode 2” of the
o
u
tdoor
u
nit PCB.
Meas
u
re the in
v
erter o
u
tp
u
t
v
oltage
(
*
1).
N
ote: Meas
u
rement sho
u
ld
b
e made
w
hile the fre
qu
ency is sta
b
le.
Replace the in
v
erter PCB.
Replace the in
v
erter compressor.
Is the stop
v
al
v
e
open?
Are the relay
w
ires
to the compressor
correct?
Is the
connection of U
VW
phase order
correct?
Is the
w
iring the
same as in the
w
iring diagram.
The ins
u
lation
resistance of the compressor
is lo
w
(not more than
100
κΩ
).
The compressor
coil has disconnection
of
w
ires.
Restart the
compressor, and then check
w
hether or not the
error rec
u
rs.
Has the
compressor started
u
p
at high differential press
u
re
(not less than
0.5MPa)?
Check
if the in
v
erter
o
u
tp
u
t
v
oltage
b
et
w
een 3
phases is
w
ithin
± 5
V
.
Defecti
v
e press
u
re e
qu
alizing
Check the refrigerant system.
Concl
u
de the
w
ork
There is a possi
b
ility of defecti
v
e
press
u
re e
qu
alizing.
Check the refrigerant system.
Replace the relay
w
ires and then
sec
u
rely connect the connectors.
Local factor
Open the stop
v
al
v
e.
CHECK 4
CHECK 4