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SiUS091133 Troubleshooting
Service Diagnosis 94
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 104
U2
Low-voltage detection or over-voltage detection 107
U4
Signal transmission error (between indoor unit and outdoor unit) 109
UA
Unspecified voltage (between indoor unit and outdoor unit) 112
Indoor
Unit
A1
Indoor unit PCB abnormality 95
A5
Freeze-up protection control or heating peak-cut control 97
A6
Fan motor or related
abnormality
DC motor (FTXS series) 99
AC motor (FDXS series) 101
C4
Indoor heat exchanger thermistor or related abnormality 103
C9
Room temperature thermistor or related abnormality 103
Outdoor
Unit
E1
Outdoor unit PCB abnormality 113
E5
OL activation (compressor overload) 115
E6
Compressor lock 116
E7
DC fan lock 117
E8
Input overcurrent detection 118
EA
FourWay valve abnormality 119
F3
Discharge pipe temperature control 121
F6
High pressure control in cooling 123
H0
Compressor system sensor abnormality 125
H6
Position sensor abnormality 128
H8
DC voltage / current sensor abnormality (09/12 class only) 131
CT or related abnormality (24/30/36 class only) 132
H9
Outdoor temperature thermistor or related abnormality 134
J3
Discharge pipe thermistor or related abnormality 134
J6
Outdoor heat exchanger thermistor or related abnormality 134
L3
Electrical box temperature rise 136
L4
Radiation fin temperature rise 138
L5
Output overcurrent detection 140
P4
Radiation fin thermistor or related abnormality 134
U7
Signal transmission error on outdoor unit PCB
(24/30/36 class only)
111
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