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Installation Manual
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.
MAX
MULTI
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MULTI
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Troubleshooting Using Error Codes
Refer to the table below and on the next page for information on the
error codes that are generated from the indoor and outdoor units.
These codes are the most common that will manifest through these
units. The system installed might generate additional codes not
listed here. Contact an LG trained service provider if these types of
errors are seen., and a simple power down and boot up has not cor-
rected the issue. The end user should not attempt to fix the system.
Error Codes
• Error codes indicate different types of unit failures, assists in self-
diagnosis and to track the frequency of occurrence.
• Error codes are shown on the LEDs of indoor units, wired remote
controller, the outdoor unit control board, and LG Monitoring View
(LGMV) Diagnostic Software.
• 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.
Error Codes
Decoding the Error Display
The first and second number on the LED indicates error number.
Example: 21 = LED1 2x blink, LED2 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.
Figure 67: Example of Ceiling Cassette IDU LEDs (appearance will differ
depending on model).
Error
Code
Description
No. of Times Indoor Unit
LEDs Blink
LED 1 LED 2
1 Indoor unit room temperature sensor error
1X -
2 Indoor unit inlet pipe sensor error 2X -
4 Float switch error (optional) 4X -
5 Communication error between indoor unit and outdoor units - 5X
6 Indoor unit outlet pipe sensor error 6X -
9 Indoor unit EEPROM error 9X -
10 Indoor unit BLDC motor fan lock - 1X
12 Indoor unit middle pipe sensor error 2X 1X
Table 22: Multi Zone Ceiling Cassette Indoor Unit Error Codes.
TROUBLESHOOTING
Number of Blinks = Error Code
LED 1: Units PlaceLED 2: Tens Place
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