SiMX042215E
Troubleshooting
Part 6 Service Diagnosis
57
Note
4.2 Indoor Unit PCB Abnormality
Error Code
A1
Method of Error
Detection
The system checks if the circuit works properly within the microcomputer of the indoor unit.
Error Decision
Conditions
The system cannot set the internal settings.
Supposed
Causes
Wrong models interconnected
Defective indoor unit PCB
Disconnection of connector
Reduction of power supply voltage
Troubleshooting
R6000615
Wire harness (Connector): Terminal strip ~ Control PCB (H1, H2, H3)
Check the connection of
connectors/
w
ire harness.
★
Correct the connection.
OK?
Check the po
w
er s
u
pply
v
oltage.
Start operation.
Voltage as rated?
Error repeats?
Check the po
w
er s
u
pply
v
oltage.
Start operation.
Voltage as rated?
Error repeats?
Error repeats?
Com
b
ination of
the indoor and o
u
tdoor
u
nit matched?
YES
N
O
N
O
YES
N
O
N
O
YES
Caution
To sec
u
re the connection,
disconnect the connectors once
and then reconnect.
YES
N
O
YES
N
O
YES
N
O
YES
Match the compati
b
le
models.
Correct the po
w
er
s
u
pply.
Replace the indoor
u
nit
PCB (control PCB).
Completed.
Completed.
Correct the po
w
er
s
u
pply.
Replace the indoor
u
nit
PCB (control PCB).
Completed.
Be s
u
re to t
u
rn off the po
w
er s
w
itch
b
efore connecting or disconnecting
connectors, or parts may
b
e damaged.
