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TROUBLESHOOTING
Troubleshooting Using Error Codes
Refer to the table below for error codes that are generated from the
indoor units (see the Multi F / Multi F MAX Outdoor Unit Installation
Manual for outdoor unit error codes). 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
• Indicate different types of unit failures, assists in self-diagnosis and
to track the frequency of occurrence.
• Error codes are displayed on indoor unit LEDs, wired remote con-
trollers, the outdoor unit PCB, and through the SIMS app and LG
Monitoring View (LGMV) diagnostic software. Also, check the wired
• If two or more errors occur simultaneously, the lower error code
number is displayed first.
• After the error is resolved, the error code does not display.
Table 19: Multi Zone Wall-Mounted Indoor Unit Error Codes
Error
Code
1
2
4
5
Communication error between indoor unit and outdoor units
6
9
10
12
58
Description
Indoor unit room temperature sensor error
Indoor unit inlet pipe sensor error
Float switch error (optional)
Indoor unit outlet pipe sensor error
Indoor unit EEPROM error
Indoor unit BLDC motor fan lock
Indoor unit middle pipe sensor error
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.
Decoding the Error Display
The first and second number on the LED indicates error number. Ex-
ample: 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.
F
MULTI
F
MULTI
MAX
Number of Times Indoor Unit
LEDs Blink
LED 2
LED 1
-
1X
-
2X
-
4X
-
5X
-
6X
-
9X
1X
-
1X
2X
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