Error Code Tables; Error Code Display; Nomenclature Definitions - LG Multi V5 Service Manual

ERROR CODE TABLES

Please refer to the Safety Precautions on pages 4-7 for more detail to prevent injury or death regarding the operation and service
WARNING
troubleshooting of the Multi V product.

Error Code Display

The seven segment display on the main board displays error codes.
Error codes are 3 or 4 digit numbers. The rightmost number desig-
nates the ODU frame (1=Master; 2=Slave1; 3=Slave2). The other
two or three digits indicate the error.
Examples: 211 = Error No. 21 on master unit; 212 = Error No. 21 on
slave 1 unit; 213 = Error No. 21 on slave2 unit, 1051 = Error No. 105
on master unit.
• c1 refers to inverter 1 and c2, inverter 2, etc.
• Heat recovery unit errors will be followed by the heat recovery unit number as displayed on LGMV, or adding one (1) to the rotary switch
setting.
•
• After error is resolved, the error code disappears.

Nomenclature Definitions

• MICOM: Non-volatile memory chip where unit setup information is stored.
•
stored.
See the error code tables below and on the following pages. Pages after the tables include detailed information for the error codes used for
Multi V systems.
Table 68: Error Codes.
Error Code
Indoor unit return air or optional remote wall tempera-
0 1
ture sensor communications error.
Indoor unit inlet pipe temperature sensor communica-
0 2
tion error.
Communication error between zone controller and
0 3
indoor unit.
0 4 Indoor unit drain overflow error.
Communication error between outdoor unit PCB and
0 5
indoor unit PCB.
Indoor unit or hydro kit outlet pipe temperature sensor
0 6
error.
7 Indoor units are not operating in the same mode. (Heat
0
pump applications only)
Hydro kit hot water storage tank temperature
0 8
sensor error.
0 9 Indoor unit EEPROM error.
126
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.
Figure 63: Example of an Error Code.
2 1 2
Compressor Error
Indoor unit air temperature sensor disconnected or shorted. (Check the
wiring, connection on the indoor unit PCB, then check the thermistor.)
Indoor unit inlet pipe temperature sensor is disconnected or shorted.
(Check the connection on the indoor unit PCB, then check the therm-
istor.)
Indoor unit PCB is not receiving communications signal from zone
controller.
Drain pump and/or float switch could be malfunctioning. Also check
drain line for obstructions.
Indoor unit communications PCB is not receiving signal from outdoor
unit communications PCB for more than 5 minutes. Check indoor unit
PCB for issues.
• Indoor unit outlet pipe temperature sensor is disconnected or short-
ed. (Check the connection on the indoor unit PCB, then check the
thermistor.)
• Hydro kit liquid side temperature sensor is disconnected or short-
Different operation mode between indoor units.
Pipe temperature sensor disconnected, shorted, or opened.
• Communication error between the indoor unit PCB board and its
indoor unit PCB board. Check connection between the two.)
• Communication error between EEPROM on indoor unit main PCB.
• Indoor unit EEPROM data is not available.
c 1 2
Compressor Error
Unit; 1 = Master, 2 = Slave1, 3 = Slave2
Details
Repeats