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TROUBLESHOOTING
Error Codes
Troubleshooting Using Error Codes
Refer to the table below and on the next page for error codes that
are generated from the indoor and outdoor units. These codes are
the most common. Your particular system might generate additional
codes not listed here. Please contact LG Support if you see these
types of errors and a simple power cycle has not corrected the issue.
Error Codes
• Error codes are shown on the control boards of indoor unit and
outdoor units, LG Monitoring View (LGMV) Diagnostic Software,
and the SIMs app.
• Error codes are also displayed on the wired wall remote controller,
if installed.
• Error codes indicate different types of unit failures, assists in
self-diagnosis and to track the frequency of occurrence.
Table 27: Single Zone Wall Mounted Indoor Unit Error Codes.
Error
Code
1
Indoor unit room temperature sensor error
2
Indoor unit inlet pipe sensor error
4
Float switch error (optional)
5
Communication error between indoor unit and outdoor units
6
Indoor unit outlet pipe sensor error
9
Indoor unit EEPROM error
10
Indoor unit BLDC motor fan lock
12
Indoor unit middle pipe sensor error
21
DC Peak (IPM Fault); Compressor DC voltage was too high
22
Current Transformer2 (CT2) error; Alternating current (AC) input too high
23
DC Link Low Volt
25
AC Low / High Volt
26
DC Comp Position Error (not providing rotation), Locking
27
PSC Fault; Current to inverter compressor between AC and DC converter circuit too high
28
Inverter compressor DC voltage is too high
29
Inverter compressor amperage is too high
31
Current-to-current transformer (CT) thermistor is too low
32
Inverter Compressor Discharge Pipe (D-Pipe) Overheat
40
CT Sensor Error; Thermistor is disconnected or shorted out
41
D-Pipe Sensor INV is disconnected or shorted out
44
Outdoor Air Sensor is disconnected or shorted out
45
Middle thermistor of outdoor unit condenser coil is disconnected or shorted out
46
Outdoor unit suction line thermistor is disconnected or shorted out
48
Outdoor unit coil outlet (liquid line) thermistor is disconnected or shorted out
53
Communication failure from outdoor unit to indoor unit
60
Outdoor unit printed circuit board (PCB) EEPROM check sum error
61
Outdoor unit condenser coil temperature is too high
62
Outdoor unit inverter compressor PCB heat sink temperature is too high
63
Condenser coil pipe thermistor temperature is too low
65
Heat sink thermistor has disconnected or has shorted out
67
Outdoor brushless direct current (BLDC) fan motor lock error
Refer to Service Manuals posted on www.lghvac.com for a full description of all error codes and work-arounds.
74
Description
Due to our policy of continuous product innovation, some specifications may change without notification.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. "LG" is a registered trademark of LG Corp.
• If two or more errors occur simultaneously, the lower error code
number is displayed first.
• After error is resolved, the error code does not display.
Decoding the Error Display
The first and second number on the LED indicates error number.
Example: 21 = LED1 (Green light) 2x blink, LED2 (Red light) 1x blink.
Error Code Nomenclature Definitions
• MICOM: Non-volatile memory chip where unit setup information is
stored.
• EEPROM: Non-volatile memory chip where device identification,
size, and factory defined default component operating parameters
are stored.
No. of Times Indoor Unit LEDs Blink
LED1
LED2
1X
-
2X
-
4X
-
5X
6X
-
9X
-
-
1X
2X
1X
2X
1X
2X
2X
2X
3X
2X
5X
2X
6X
2X
7X
2X
8X
2X
9X
3X
1X
3X
2X
4X
-
4X
1X
4X
4X
4X
5X
4X
6X
4X
8X
5X
3X
6X
-
6X
1X
6X
2X
6X
3X
6X
5X
6X
7X
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