Service Manual

Troubleshooting SiUS041638E
57 Service Diagnosis
4. Troubleshooting
4.1 Error Codes and Description

: Displayed only when system-down occurs.
Error Codes Description
Reference
Page
System
00
Normal —
U2
Low-voltage detection or over-voltage detection 64
U4
Signal transmission error (between indoor unit and outdoor unit) 66
UA
Mismatching of indoor unit and outdoor unit 69
Indoor
Unit
A1
Indoor unit PCB abnormality 58
A5
Freeze-up protection control/heating peak-cut control 60
A6
Indoor fan motor (DC motor) or related abnormality 61
C4
Indoor heat exchanger thermistor or related abnormality 63
C9
Room temperature thermistor or related abnormality 63
Outdoor
Unit
E1
Outdoor unit PCB abnormality 70
E5
OL activation (compressor overload) 71
E6
Compressor lock 73
E7
DC fan lock (outdoor fan) 74
E8
Input overcurrent detection 75
EA
Four way valve abnormality 76
F3
Discharge pipe temperature control 78
F6
High pressure control in cooling 79
F8
System shutdown due to compressor internal temperature
abnormality
80
H0
Compressor system sensor abnormality 81
H6
Position sensor abnormality 82
H8
CT or related abnormality 84
H9
Outdoor temperature thermistor or related abnormality 86
J3
Discharge pipe thermistor or related abnormality 86
J6
Outdoor heat exchanger thermistor or related abnormality 86
L3
Electrical box temperature rise 88
L4
Radiation fin temperature rise 89
L5
Output overcurrent detection 90
P4
Radiation fin thermistor or related abnormality 86
U7
Signal transmission error on outdoor unit PCB 68