Troubleshooting; Error Codes - LG LMCN077HV Installation Manual

F
MULTI
F
MULTI MAX
Troubleshooting Using Error Codes
Refer to Table 36 for information on the error codes that are gener-
ated 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 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
Code
1
2
4
5 Communication error between indoor unit and outdoor units
6
9
10
12
Table 36: Multi Zone Ceiling Cassette Indoor Unit Error Codes.
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 EPROM 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.

TROUBLESHOOTING

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.
• EPROM: Non-volatile memory chip where device identification,
size, and factory defined default component operating param-
eters are stored.
Figure 73: Example of Ceiling Cassette IDU LEDs (appearance may
Ceiling Cassette Indoor Unit Display
differ depending on model).
Wall-Mounted Indoor Unit Displays
Standard
Cooling
LED 1
Units Place
Heating
LED 2
(Plasma LED)
Tens Place
Plasma
Receiver
Error Codes
LED 2: Tens Place LED 1: Units Place
Number of Blinks = Error Code
Art Cool Mirror
No. of Times Indoor Unit
LEDs Blink
Receiver
LED1 LED2
(Power LED)
Power
LED 1:
Units Place
1X -
Plasma
LED 2:
Tens Place
2X -
Preheating
4X -
- 5X
Number of Blinks = Error Code
6X -
9X -
- 1X
2X 1X
51