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Service Diagnosis
3.5 Error Code Description for Inverter
NO.
ERROR CODE
1
00
2
A1
3
A3
4
A5
5
A6
6
C4
7
C9
8
F6
9
U0
10
U4
11
UA
Note:
O : Function
- : No function
Description
Indoor PCB abnormality
Supposed Cause
1. Faulty indoor PCB.
2. Faulty connector connection at indoor.
Troubleshooting
18
ERROR DESCRIPTION
NORMAL
INDOOR PCB ABNORMALITY
DRAIN PUMP ABNORMALITY
ANTIFREEZE PROTECTION/HIGH
PRESSURE CONTROL
INDOOR FAN MOTOR ABNORMALITY
INDOOR HEAT EXCHANGER THERMISTOR
ABNORMALITY
INDOOR ROOM THERMISTOR ABNORMALITY
HEAT EXCHANGER OVERHEAT
INSUFFICIENT GAS
COMMUNICATION ABNORMALITY
INSTALLATION ERROR
Turn off unit.
Check indoor PCB connector
conditions (including PCB to
terminal block and all PCB wire
connector).
Any sign
of loose or
abnormal.
No
Replace indoor PCB and
operate again.
A1
Yes
ACQ
AHQ
ABQ
O
O
O
O
O
-
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
Connect correctly and
operate again.
O
O
-
O
O
O
O
O
O
O
O
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