Error No. 51(1) - LG Multi V5 Service Manual

ERROR CODES

Error No. 51(1)

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 No. Description
511
Combination ratio
is out of range.
Master: 511
Is the total indoor unit
capacity <130% of the
outdoor unit capacity on
the LGMV report?
Yes
Check if the DIP
switches below are set
to ON:
Slave 1: No. 6
Slave 2: No. 7.
Yes
Is the power to the
Slave PCB On (see if LED
is blinking)?
Yes
Are communication cables
between master / slave outdoor
units connected correctly?*
Yes
Are error codes displayed
in the order below after the
power is reset? (Slave 2
Slave 1 Master).
Yes
End
* Check communication cables between outdoor units in the following order:
PCB connections
164
Value of total indoor unit capacity exceeds
allowable outdoor unit capacity specifications.
Quantity and capacity
No
of the installed indoor units
match the LGMV data?
Adjust the capacity of indoor
and outdoor units.
No
Reset corresponding DIP switches.
Nso
(Terminal Block T-N)?
Check and replace PCB,
line fuse, transformer.
No
Reconnect cables.
Replace Master or Slave
No
PCB.
terminal block communication cables.
Due to our policy of continuous product innovation, some specifications may change without notification.
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Details
1. Total indoor unit capacity is more than
2. Wrong communication cable / piping
3. Control error of slave outdoor unit DIP
4. Defective slave unit PCB power supply.
5. Defective outdoor unit PCB.
6. Failed Master outdoor unit main PCB can
No
Yes
Is the main power
No
supplied correctly
Yes
Causes
130% outdoor unit rated capacity.
connections.
switches.
also cause this error if it could not see the
slave outdoor unit.
Check the communication
cables between indoor and
outdoor units.
Supply main
power again.