Service manual

Troubleshooting SiBE06-708_C
82 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 88
U2
Low-voltage detection or over-voltage detection 91
U4
Signal transmission error (between indoor unit and outdoor unit) 93
UA
Unspecified voltage (between indoor unit and outdoor unit) 96
Indoor
Unit
A1
Indoor unit PCB abnormality 83
A5
Freeze-up protection control or heating peak-cut control 84
A6
Fan motor (DC motor) or related abnormality 85
C4
Indoor heat exchanger thermistor or related abnormality 87
C9
Room temperature thermistor or related abnormality 87
Outdoor
Unit
E1
Outdoor unit PCB abnormality 97
E5
OL activation (compressor overload) 99
E6
Compressor lock 101
E7
DC fan lock 102
E8
Input overcurrent detection 103
EA
Four way valve abnormality 104
F3
Discharge pipe temperature control 106
F6
High pressure control in cooling 107
H0
Compressor system sensor abnormality 108
H6
Position sensor abnormality 110
H8
DC voltage / current sensor abnormality (25/35 class only) 113
CT or related abnormality
(RK(X)S50F2V1B, RK(X)S50G2V1B, RXS50J2V1B only)
114
H9
Outdoor temperature thermistor or related abnormality 116
J3
Discharge pipe thermistor or related abnormality 116
J6
Outdoor heat exchanger thermistor or related abnormality 116
L3
Electrical box temperature rise 118
L4
Radiation fin temperature rise 121
L5
Output overcurrent detection 124
P4
Radiation fin thermistor or related abnormality 116
U7
Signal transmission error on outdoor unit PCB
(RK(X)S50F2V1B, RK(X)S50G2V1B, RXS50J2V1B only)
95