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Troubleshooting
SiBE06-708_A
83
Service Diagnosis
4. Troubleshooting
4.1
Error Codes and Description
★
: Displayed only when system-down occurs.
Error Codes
Description
Reference
Page
System
00
Normal
—
U0
★
Refrigerant shortage
121
U2
Low-voltage detection or over-voltage detection
124
U4
Signal transmission error (between indoor unit and outdoor unit)
90
UA
Unspecified voltage (between indoor unit and outdoor unit)
91
Indoor
Unit
A1
Indoor unit PCB abnormality
84
A5
Freeze-up protection control or heating peak-cut control
85
A6
Fan motor (DC motor) or related abnormality
87
C4
Indoor heat exchanger thermistor or related abnormality
89
C9
Room temperature thermistor or related abnormality
89
Outdoor
Unit
E1
Outdoor unit PCB abnormality
92
E5
★
OL activation (compressor overload)
94
E6
★
Compressor lock
95
E7
DC fan lock
96
E8
Input overcurrent detection
97
EA
Four way valve abnormality
98
F3
Discharge pipe temperature control
100
F6
High pressure control in cooling
101
H0
Compressor system sensor abnormality
103
H6
Position sensor abnormality
105
H8
DC voltage / current sensor abnormality (25/35 class)
108
CT or related abnormality (50 class)
109
H9
Outdoor temperature thermistor or related abnormality
111
J3
Discharge pipe thermistor or related abnormality
111
J6
Outdoor heat exchanger thermistor or related abnormality
111
L3
Electrical box temperature rise
113
L4
Radiation fin temperature rise
116
L5
Output overcurrent detection
119
P4
Radiation fin thermistor or related abnormality
111
U7
Signal transmission error on outdoor unit PCB (50 class only)
126