Service manual

SiBE061121_A Troubleshooting
Service Diagnosis 63
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 71
U2
Low-voltage detection or over-voltage detection 74
U4
Signal transmission error (between indoor unit and outdoor unit) 76
UA
Unspecified voltage (between indoor unit and outdoor unit) 79
Indoor
Unit
A1
Indoor unit PCB abnormality 64
A5
Freeze-up protection control or heating peak-cut control 65
A6
Fan motor (DC motor) or related abnormality 66
A9
Radiant panel temperature rise, indoor electronic expansion
valve (motor operated valve) abnormality, freeze-up protection
control
68
C4
Indoor heat exchanger thermistor or related abnormality 70
C9
Room temperature thermistor or related abnormality 70
CE
Radiant panel thermistor or related abnormality 70
Outdoor
Unit
E1
Outdoor unit PCB abnormality 80
E5
OL activation (compressor overload) 82
E6
Compressor lock 84
E7
DC fan lock 85
E8
Input overcurrent detection 86
EA
Four way valve abnormality 87
F3
Discharge pipe temperature control 89
F6
High pressure control in cooling 90
H0
Compressor system sensor abnormality 91
H6
Position sensor abnormality 93
H8
DC voltage / current sensor abnormality (25/35 class only) 96
CT or related abnormality (RXG50K2V1B only) 97
H9
Outdoor temperature thermistor or related abnormality 99
J3
Discharge pipe thermistor or related abnormality 99
J6
Outdoor heat exchanger thermistor or related abnormality 99
L3
Electrical box temperature rise 101
L4
Radiation fin temperature rise 102
L5
Output overcurrent detection 104
P4
Radiation fin thermistor or related abnormality 99
U7
Signal transmission error on outdoor unit PCB
(RXG50K2V1B only)
78