Error Codes and Description SiUS091601EA
123 Part 6 Service Diagnosis
4. Error Codes and Description
: Displayed only when system down occurs.
Error
Codes
Description
Reference Page
FTX FVXS FDMQ
System 00 Normal — — —
U0 Refrigerant shortage — — —
U2 Low-voltage detection or over-voltage detection 133 133 146
U4 Signal transmission error (between indoor unit
and outdoor unit)
135 135 148
U5 Signal transmission error (between indoor unit
and remote controller)
——150
U8 Signal transmission error (between MAIN/SUB
remote controller)
——151
UA Unspecified voltage (between indoor unit and
outdoor unit)
137 137 152
Indoor
Unit
A1 Indoor unit PCB abnormality 124 124 138
A3 Drain level control system abnormality — — 139
A5 Freeze-up protection control/heating peak-cut
control
126 126 —
A6 Indoor fan motor (DC motor) or related
abnormality
128 128 140
A8 Indoor fan PCB abnormality — — 142
AF Humidifier or related abnormality — — 143
C4 Indoor heat exchanger thermistor or related
abnormality
132 132 144
C5 ——144
C9 Room temperature thermistor or related
abnormality
132 132 144
CJ Remote controller thermistor abnormality — — 145
Outdoor
Unit
E1 Outdoor unit PCB abnormality 153
E5 OL activation (compressor overload) 154
E6 Compressor lock 157
E7 DC fan lock 158
E8 Input overcurrent detection 159
EA Four way valve abnormality 161
F3 Discharge pipe temperature control 163
F6 High pressure control in cooling 165
F8 System shutdown due to temperature abnormality
in the compressor
167
H0 Compressor system sensor abnormality 168
H6 Position sensor abnormality 169
H9 Outdoor temperature thermistor or related
abnormality
172
J3 Discharge pipe thermistor or related abnormality 172
J6 Outdoor heat exchanger thermistor or related
abnormality
172
L3 Electrical box temperature rise 174
L4 Radiation fin temperature rise 176
L5 Output overcurrent detection 178
P4 Radiation fin thermistor or related abnormality 172
U7 Signal transmission error on outdoor unit PCB 180
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