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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
A
1
2
3
4
5
3
3
3
3
00
Normal condition
—
UA
Unspecified voltage (between indoor unit and outdoor unit)
162
UH
Anti-icing function in other rooms
162
5
3
3
4
4
(
U0
)
Refrigerant shortage
156
5
4
3
3
4
U2
Low-voltage detection or over-voltage detection
159
5
3
4
4
4
U7
Signal transmission error (on outdoor unit PCB) (24/32 class only)
161
5
4
3
4
4
A5
Anti-icing function
163
5
4
4
4
3
E1
Outdoor unit PCB abnormality
(24/32 class only)
165
5
4
3
4
3
(
E5
)
OL activation (compressor overload)
166
5
3
4
4
3
(
E6
)
Compressor lock
167
5
4
4
4
4
E7
DC fan lock
168
5
3
4
3
4
E8
Input overcurrent detection
169
5
4
3
3
3
EA
Four
-
way valve abnormality (18 class only)
170
5
4
3
4
3
F3
Discharge pipe temperature control
172
5
4
3
4
4
F6
High pressure control in cooling
173
5
4
4
3
3
H0
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
5
4
4
3
4
L3
Electrical box temperature rise
183
5
3
3
3
4
L4
Radiation fin temperature rise
186
5
3
3
4
3
L5
Output overcurrent detection
189