Specifications

SiUS12-928_A Troubleshooting
Service Diagnosis 102
5.2 Outdoor Unit
4: ON, 1: OFF, 5: Blinks
Normal condition : Green - blinks, Red - OFF
Note: 1. The error codes in the parenthesis ( ) are displayed only when the system is shut down.
2. When a sensor error occurs, check the remote controller display to determine which sensor is
malfunctioning.
If the remote controller does not indicate the error code, conduct the following procedure.
*Turn the power switch off and back on again. If the same LED indication appears again
immediately after the power is turned on, the fault is in the thermistor.
*If the above condition does not result, the fault is in the CT.
3. The indoor unit error code may take the precedence in the remote controller display.
Outdoor Unit LED Indication Error Codes Description of Fault
Reference
Page
Green Red
A1234
333300
Normal condition —
UA
Unspecified voltage (between indoor and outdoor units) 148
UH
Anti-icing function in other rooms 148
53344 (U0)
Refrigerant shortage 143
U2
Low-voltage detection or over-voltage detection 146
U7
Signal transmission error (on outdoor unit PCB)
(24/32 class)
147
A5
Anti-icing function 113
E1
Outdoor unit PCB abnormality (24/32 class) 115
(E5)
OL activation (compressor overload) 116
(E6)
Compressor lock 117
E7
DC fan lock 118
E8
Input overcurrent detection 119
EA
Four-way valve abnormality (18 class) 121
F3
Discharge pipe temperature control 123
F6
High pressure control in cooling 124
H0
Compressor sensor system abnormality
(24/32 class)
126
H8
CT or related abnormality 131
H6
Position sensor abnormality 128
H9
Outdoor temperature thermistor or related abnormality 133
J3
Discharge pipe thermistor or related abnormality 133
J6
Outdoor heat exchanger thermistor or related abnormality 133
J8
Liquid pipe thermistor or related abnormality 133
J9
Gas pipe thermistor or related abnormality 133
P4
Radiation fin thermistor or related abnormality 133
L3
Electrical box temperature rise 135
L4
Radiation fin temperature rise 138
L5
Output overcurrent detection 141