Code Indication on Remote Controller SiUS12-928_B
145 Service Diagnosis
4.2 Outdoor Unit
4: ON, 3: OFF, 5: Blinks
Green : Blinks in normal condition
Red : OFF in normal condition
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
Reference
Page
Green Red
A1234
5333300
Normal condition —
UA
Unspecified voltage (between indoor unit and outdoor unit)
162
UH
Anti-icing function in other rooms 162
53344 (U0)
Refrigerant shortage 156
54334U2
Low-voltage detection or over-voltage detection 159
53444U7
Signal transmission error (on outdoor unit PCB) (24/32 class only) 161
54344A5
Anti-icing function 163
54443E1
Outdoor unit PCB abnormality (24/32 class only) 165
54343 (E5)
OL activation (compressor overload) 166
53443 (E6)
Compressor lock 167
54444E7
DC fan lock 168
53434E8
Input overcurrent detection 169
54333EA
Four-way valve abnormality (18 class only) 170
54343F3
Discharge pipe temperature control 172
54344F6
High pressure control in cooling 173
54433H0
Compressor sensor system abnormality (24/32 class only) 174
H6
Position sensor abnormality 176
H8
CT or related abnormality 179
H9
Outdoor temperature thermistor or related abnormality 181
J3
Discharge pipe thermistor or related abnormality 181
J6
Outdoor heat exchanger thermistor or related abnormality 181
J8
Liquid pipe thermistor or related abnormality 181
J9
Gas pipe thermistor or related abnormality 181
P4
Radiation fin thermistor or related abnormality 181
54434L3
Electrical box temperature rise 183
53334L4
Radiation fin temperature rise 186
53343L5
Output overcurrent detection 189
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