
Si04-402 Troubleshooting
Service Diagnosis 71
4. Troubleshooting
4.1 Error Codes and Description
★
: Displayed only when system-down occurs.
Code Indication Description
Reference
Page
System
00
Normal
—
U0★
Insufficient gas
99
U2
Over-voltage detection
101
U4
Signal transmission error (between indoor and outdoor unit)
79
U5
Signal transmission error (between indoor unit and wired remote
controller)
80
UA
Unspecified voltage (between indoor and outdoor unit)
81
Indoor
Unit
A1
Indoor unit PCB abnormality
72
A5
Freeze-up protection control or high pressure control
73
A6
Fan motor or related abnormality
75
C4
Heat exchanger thermistor abnormality
77
C7
Front panel open / close fault
78
C9
Room temperature thermistor abnormality
77
Outdoor
Unit
E1
Outdoor unit PCB abnormality
82
E5★
OL activation (compressor overload)
83
E6★
Compressor lock
84
E7
DC fan lock
85
E8
Input over current detection
86
EA
Four way valve abnormality
87
F3
Discharge pipe temperature control
89
F6
High pressure control in cooling
90
H0
Sensor abnormality around compressor system
92
H6
Position sensor abnormality
93
H8
DC voltage / current sensor abnormality
94
H9
Outdoor air thermistor or related abnormality
95
J3
Discharge pipe thermistor or related abnormality
95
J6
Heat exchanger thermistor or related abnormality
95
L5
Output over current detection
97
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