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TROUBLESHOOTING
Error Codes
Troubleshooting Using Error Codes
Refer to Table 21 and Table 22 for error codes that are generat-
ed from the indoor and outdoor units. These codes are the most
common that will manifest through these units. Your particular model
duct free system might generate additional codes not listed here.
Please contact LG Support if you see these types of errors and a
simple power down and boot up has not corrected the issue. You
should not attempt to fix the system yourself.
Error Codes
• Error codes for indoor units will be displayed on the wall controller.
• Indicate different types of unit failures, assists in self-diagnosis and
to track the frequency of occurrence.
• Are shown on the wired remote controller, the Single Zone unit con-
trol board, and LG Monitoring View (LGMV) Diagnostic Software.
Table 21: 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
56
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 (for Outdoor Units)
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.
• EPROM: Non-volatile memory chip where device identification,
size, and factory defined default component operating parameters
are stored.
- Quick Links:
- Self Diagnosis Functions
- Error Codes
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