Service manual

Troubleshooting SiBE05-722_C
60 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 65
U2
Low-voltage detection or over-voltage detection 67
U4
Signal transmission error (between indoor unit and outdoor unit) 69
UA
Unspecified voltage (between indoor unit and outdoor unit) 71
Indoor
Unit
A1
Indoor unit PCB abnormality 61
A5
Freeze-up protection control or heating peak-cut control 62
A6
Fan motor (AC motor) or related abnormality 63
C4
Indoor heat exchanger thermistor or related abnormality 64
C9
Room temperature thermistor or related abnormality 64
Outdoor
Unit
E1
Outdoor unit PCB abnormality 72
E5
OL activation (compressor overload) 73
E6
Compressor lock 75
E7
DC fan lock 76
E8
Input overcurrent detection 77
EA
Four way valve abnormality 78
F3
Discharge pipe temperature control 80
F6
High pressure control in cooling 81
H0
Compressor system sensor abnormality 82
H6
Position sensor abnormality 83
H8
DC voltage / current sensor abnormality 85
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 91
L5
Output overcurrent detection 94
P4
Radiation fin thermistor or related abnormality 86