Service manual

Troubleshooting SiUS041111
78 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 112
U2
Low-voltage detection or over-voltage detection 114
U4
Signal transmission error (between indoor unit and outdoor unit) 86
UA
Unspecified voltage (between indoor unit and outdoor unit) 88
Indoor
Unit
A1
Indoor unit PCB abnormality 79
A5
Freeze-up protection control or heating peak-cut control 80
A6
Fan motor (DC motor) or related abnormality 82
C4
Indoor heat exchanger thermistor or related abnormality 85
C9
Room temperature thermistor or related abnormality 85
Outdoor
Unit
E1
Outdoor unit PCB abnormality 89
E5
OL activation (compressor overload) 90
E6
Compressor lock 91
E7
DC fan lock 92
E8
Input overcurrent detection 93
EA
Four-way valve abnormality 94
F3
Discharge pipe temperature control 96
F6
High pressure control in cooling 98
H0
Compressor system sensor abnormality 100
H6
Position sensor abnormality 101
H8
DC voltage / current sensor abnormality (09/12 class only) 103
H9
Outdoor temperature thermistor or related abnormality 104
J3
Discharge pipe thermistor or related abnormality 104
J6
Outdoor heat exchanger thermistor or related abnormality 104
L3
Electrical box temperature rise 106
L4
Radiation fin temperature rise 108
L5
Output overcurrent detection 110
P4
Radiation fin thermistor or related abnormality 104