Error Codes - LG ARUM072BTE5 Installation Manual

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.
• If two or more errors occur simultaneously, the lower error code
number is displayed first.
• After error is resolved, the error code disappears.
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.
The error code tables below and on the following pages list the error codes used for Multi V systems. For detailed information on how to
troubleshoot each error, see the Multi V 5 Service Manual on www.lghvac.com.
Table 72: 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 pump error.
• Communication error between indoor unit communi-
cation PCB and indoor unit.
0 5 - • Communication error between outdoor unit and
indoor unit.
Indoor unit or hydro kit outlet pipe temperature sensor
0 6 -
error.
Indoor units are not operating in the same mode. (Heat
0 7 -
pump applications only)
Hydro kit hot water storage tank temperature
0 8 -
sensor error.
0 9 - Indoor unit EPROM error.
For detailed information on how to troubleshoot each error, see the Multi V Service Manual on www.lghvac.com.
Description
Due to our policy of continuous product innovation, some specifications may change without notification.
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ERROR CODE TABLES
Example of an Error Code.
2 1 2
Unit; 1 = Master, 2 = Slave1, 3 = Slave2
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 thermistor.)
Indoor unit PCB is not receiving communications signal from
zone controller.
Drain pump and/or flow switch is/are malfunctioning. Also check
drain line for obstructions.
• Indoor unit PCB is not receiving signal from indoor unit communi-
cations PCB for >3 consecutive minutes. Check PCBs for issues.
• Indoor unit PCB is not receiving communications signal from
outdoor unit. Check indoor unit to outdoor unit communication
cable connections for issues.
• Indoor unit outlet pipe temperature sensor is disconnected or
shorted. (Check the connection on the indoor unit PCB, then
check the thermistor.)
• Hydro kit liquid side temperature sensor is disconnected or
shorted. Values read less than -43°C or greater than +96°C
(less than -45.4°F or greater than +204.8°F).
Different operation mode between indoor units.
Pipe temperature sensor disconnected or shorted.
• Communication error between the indoor unit PCB board and its
option card. (The option card is about 1' x 1' and is plugged into
the indoor unit PCB board. Check connection between the two.)
• Communication error between EPROM on indoor unit main PCB.
• Indoor unit EPROM data is not available.
c 1 2
Repeats
Compressor Error
Details
159